Wear a Smartwatch with Your Longines | Smartlet

Q: Does Smartlet work with Longines Spirit?

Yes. The Longines Spirit uses 20mm lugs, natively supported by Smartlet.

Q: Does Smartlet work with Longines HydroConquest?

Yes. The HydroConquest 41mm uses 20mm lugs. The Chronograph 43mm uses 22mm lugs. Both natively supported.

Q: Does Smartlet modify my Longines?

No. Smartlet replaces the strap via the standard spring-bar system. Fully reversible in seconds.

How it works

Three steps to both watches on one wrist

Choose your strap

Smartlet One is your new strap. It replaces the original bracelet or strap on your Longines using the same spring-bar system. Lug widths 18mm / 19mm / 20mm are all natively supported.

Clip in your watch

Attach the Smartlet strap to your Longines by fitting the spring bars into the lugs, exactly as with any standard strap change. No tools required. Fully reversible in seconds.

Clip in your smartwatch

Slide your smartwatch into the Smartlet module. It locks onto the strap module on the wrist side of your wrist. All sensors remain fully operational. Both watches run simultaneously.

Full database

Other Longines models

216 references grouped into 8 model families. All compatible. Expand any group to see variants, references, and specifications.

Conquest

18mm / 19mm / 20mm / 21mm / 22mm18 refs · 9 variants+

Reference Material Dial Lug Smartlet

Conquest 100m

CQ-1988-100M Stainless Steel Silver 20mm Compatible

Conquest 41

L3.430.4.09.6 Steel Green 20mm Compatible L3.430.4.52.6 Steel Black 20mm Compatible L3.430.4.97.6 Steel Blue 20mm Compatible

Conquest 43

L3.700.4.56.6 Stainless Steel Black 22mm Compatible

Conquest Auto

L3.778.4.56.6 Stainless Steel Black 21mm Compatible L3.778.4.96.6 Stainless Steel Blue 21mm Compatible

Conquest Chronograph

L3.835.4.56.2 Steel Black 22mm Compatible L3.835.4.92.2 Steel Blue 22mm Compatible

Conquest Early

Cal19AS-1954 Stainless Steel Silver 18mm Compatible

Conquest JDM

JDM-CQ-1998 Stainless Steel White 19mm Compatible

Conquest Power

Cal290-1956 Stainless Steel Silver 18mm Compatible

Conquest VHP

L3.726.4.56.6 Steel Black 20mm Compatible L3.726.4.96.6 Steel Blue 20mm Compatible L3.727.4.56.6 Steel Black 21mm Compatible L3.727.4.76.6 Steel Silver 21mm Compatible L3.716.4.56.6 Stainless Steel Black 21mm Compatible L3.716.4.96.6 Stainless Steel Blue 21mm Compatible

DolceVita

18mm / 19mm / 20mm4 refs · 4 variants+

Reference Material Dial Lug Smartlet

DolceVita Chronograph

L5.657.4.51.2 Stainless Steel Black 20mm Compatible

DolceVita Early

L5.155.4.16.6 Stainless Steel White Roman 18mm Compatible

DolceVita Rectangular

L5.655.4.71.3 Stainless Steel Silver 19mm Compatible

DolceVita Small

L5.655.4.71.6 Stainless Steel Silver Small Seconds 19mm Compatible

Heritage

19mm / 20mm / 22mm / 23mm30 refs · 17 variants+

Reference Material Dial Lug Smartlet

Heritage 1935

L2.838.4.53.2 Stainless Steel Black 22mm Compatible L2.794.4.53.0 Steel Black 22mm Compatible

Heritage 1945

L2.813.4.66.0 Stainless Steel Salmon 20mm Compatible

Heritage Avigation

L2.816.1.93.2 Bronze Green 20mm Compatible

Heritage Big

L2.816.4.53.2 Steel Black 20mm Compatible L2.816.1.93.2 Titanium Blue 20mm Compatible

Heritage Classic

L2.828.4.73.2 Stainless Steel Silver Sector 19mm Compatible L2.828.4.53.2 Steel Black Sector 19mm Compatible

Heritage Column-Wheel

L2.750.4.56.2 Stainless Steel Black 20mm Compatible

Heritage Diver

L2.744.4.56.2 Stainless Steel Black 22mm Compatible L2.808.4.52.6 Stainless Steel Black/Red 22mm Compatible L2.841.4.56.4 Stainless Steel Black 22mm Compatible

Heritage Legend

L3.674.4.50.0 Steel Black 22mm Compatible L3.774.4.50.0 Steel Black 22mm Compatible L3.774.4.90.2 Steel Blue 22mm Compatible L3.774.1.50.2 Bronze Black 22mm Compatible

Heritage Lindbergh

Lind-LE-1996 Stainless Steel White 20mm Compatible L2.713.4.13.0 Stainless Steel White 20mm Compatible

Heritage Marine

L2.833.4.93.2 Stainless Steel Blue 19mm Compatible

Heritage Military

L2.826.4.53.2 Stainless Steel Black 20mm Compatible

Heritage Silver

L2.834.4.72.2 Stainless Steel Silver 19mm Compatible

Heritage Skin

L2.822.4.56.9 Steel Black 22mm Compatible L2.822.4.93.2 Steel Brown 22mm Compatible

Heritage Tuxedo

L2.330.4.93.0 Stainless Steel Black/White 19mm Compatible

Heritage Type

L2.812.4.23.2 Stainless Steel White Offset 20mm Compatible

Heritage WW2

L2.713.8.11.0 Steel White 23mm Compatible

Heritage Weems

L2.607.4.23.2 Stainless Steel White 20mm Compatible

HydroConquest

18mm / 19mm / 21mm / 22mm29 refs · 9 variants+

Reference Material Dial Lug Smartlet

HydroConquest 37

L3.780.4.56.6 Steel Black 18mm Compatible L3.780.4.96.6 Steel Blue 18mm Compatible L3.780.4.06.6 Steel Green 18mm Compatible

HydroConquest 39

L3.742.4.56.6 Steel Black 19mm Compatible L3.742.4.96.6 Steel Blue 19mm Compatible

HydroConquest 41

L3.781.4.56.6 Stainless Steel Black 21mm Compatible L3.781.4.96.6 Steel Blue 21mm Compatible L3.781.3.56.7 Steel/Gold Black 21mm Compatible L3.781.3.96.7 Steel/Gold Blue 21mm Compatible L3.781.4.06.6 Steel Green 21mm Compatible L3.781.4.76.6 Steel Grey 21mm Compatible

HydroConquest 43

L3.782.4.56.6 Steel Black 22mm Compatible L3.782.4.96.6 Steel Blue 22mm Compatible

HydroConquest Auto

L3.742.4.56.6 Stainless Steel Black 21mm Compatible L3.742.4.96.6 Stainless Steel Blue 21mm Compatible L3.781.4.06.6 Stainless Steel Green 21mm Compatible

HydroConquest Ceramic

L3.781.4.56.9 Ceramic/Steel Black 21mm Compatible L3.781.4.96.9 Ceramic/Steel Blue 21mm Compatible L3.784.4.56.9 Ceramic Black 22mm Compatible L3.784.4.96.6 Ceramic Blue 22mm Compatible L3.784.4.06.9 Ceramic Green 22mm Compatible L3.784.4.76.9 Ceramic Grey 22mm Compatible

HydroConquest GMT

L3.790.4.06.6 Steel Green 21mm Compatible L3.790.4.56.6 Steel Black 21mm Compatible L3.790.4.96.6 Steel Blue 21mm Compatible L3.790.4.96.9 Steel Blue 21mm Compatible L3.790.3.06.7 Steel/Gold Green 21mm Compatible

HydroConquest Titanium

L3.782.4.76.6 Titanium Grey 21mm Compatible

HydroConquest USA

L3.781.4.99.6 Stainless Steel Blue/Red 21mm Compatible

Legend Diver

18mm / 22mm6 refs · 1 variant+

Reference Material Dial Lug Smartlet LLD-LE-2009 Stainless Steel Burgundy 22mm Compatible L3.674.4.50.0 Stainless Steel Black 22mm Compatible L3.774.4.50.0 Stainless Steel Black Date 22mm Compatible L3.374.4.50.2 Steel White 18mm Compatible L3.374.4.56.2 Steel Black 18mm Compatible L3.374.4.90.2 Steel Blue 18mm Compatible

Master Collection

18mm / 19mm / 20mm / 21mm / 22mm14 refs · 4 variants+

Reference Material Dial Lug Smartlet

Master Annual

L2.910.4.78.3 Stainless Steel Silver 20mm Compatible

Master Chronograph

L2.629.4.51.6 Stainless Steel Black 22mm Compatible

Master Collection

L2.673.4.78.3 Stainless Steel Silver 20mm Compatible L2.629.4.78.3 Steel Silver 20mm Compatible L2.257.4.75.6 Steel Blue 18mm Compatible L2.257.4.78.6 Steel Silver 18mm Compatible L2.628.4.75.6 Steel Blue 19mm Compatible L2.628.4.78.6 Steel Silver 19mm Compatible L2.893.4.71.6 Steel Silver 21mm Compatible L2.893.4.79.2 Steel Blue 21mm Compatible L2.673.4.78.6 Steel Silver 20mm Compatible L2.909.4.92.6 Stainless Steel Blue 21mm Compatible

Master Small

L2.409.4.78.6 Stainless Steel Silver 20mm Compatible

Spirit

19mm / 20mm / 21mm / 22mm21 refs · 9 variants+

Reference Material Dial Lug Smartlet

Spirit 40

L3.810.4.53.6 Steel Black 20mm Compatible L3.810.4.73.6 Steel Silver 20mm Compatible L3.810.4.93.6 Steel Blue 20mm Compatible

Spirit 42

L3.811.4.53.6 Steel Black 22mm Compatible L3.811.4.93.6 Steel Blue 22mm Compatible

Spirit Auto

L3.810.4.53.0 Stainless Steel Black 21mm Compatible L3.811.4.93.6 Stainless Steel Blue 22mm Compatible

Spirit Chronograph

L3.820.4.53.0 Stainless Steel Black 22mm Compatible

Spirit Flyback

L3.821.4.53.6 Steel Black 22mm Compatible L3.821.4.93.6 Steel Blue 22mm Compatible

Spirit Green

L3.810.4.03.2 Stainless Steel Green 21mm Compatible

Spirit JDM

JDM-SP-1999 Stainless Steel Champagne 19mm Compatible

Spirit Titanium

L3.810.1.73.2 Titanium Grey 20mm Compatible L3.811.1.73.2 Titanium Grey 22mm Compatible L3.810.1.53.2 Titanium Anthracite 21mm Compatible

Spirit Zulu

L3.812.4.93.6 Stainless Steel Blue Gmt 22mm Compatible L3.812.4.06.6 Steel Green 22mm Compatible L3.812.4.63.6 Steel Black 22mm Compatible L3.812.4.93.2 Steel Blue 22mm Compatible L3.802.4.23.6 Steel White 20mm Compatible L3.802.4.93.6 Steel Blue 20mm Compatible

Vintage / Others

18mm / 19mm / 20mm / 21mm / 22mm94 refs · 65 variants+

Reference Material Dial Lug Smartlet

Admiral 5

Admiral-1966 Stainless Steel Silver 19mm Compatible Adm5S-1968 Stainless Steel Black 19mm Compatible

Admiral 5-Star

Admiral-2003 Stainless Steel Black 20mm Compatible

Admiral Quartz

Admiral-80Q-1982 Stainless Steel Blue 19mm Compatible Admiral-80B-1985 Stainless Steel Black 19mm Compatible L3.614.4.76.6 Stainless Steel Grey 20mm Compatible

Automatic 340

Cal340-1960 Stainless Steel Silver 18mm Compatible

BigEye Pilot

L2.816.4.53.2 Stainless Steel Black 20mm Compatible

Chronograph 13ZN

13ZN-1-1936 Stainless Steel Silver 18mm Compatible 13ZN-2-1938 Stainless Steel Black 18mm Compatible 13ZN-S-1939 Stainless Steel Silver Sector 18mm Compatible 13ZN-1939 Stainless Steel Silver 18mm Compatible 13ZN-SN-1940 Stainless Steel White Snail 18mm Compatible 13ZN-FLY-1940 Stainless Steel White 19mm Compatible 13ZN-MIL-1941 Stainless Steel Black Military 19mm Compatible 13ZN-WP-1941 Stainless Steel Silver 19mm Compatible 13ZN-RG-1942 18K Rose Gold Cream 18mm Compatible

Chronograph 30CH

30CH-1951 Stainless Steel White 18mm Compatible 30CH-1952 Stainless Steel Silver 19mm Compatible 30CH-BLK-1953 Stainless Steel Black 19mm Compatible 30CH-LAN-1955 Stainless Steel Silver 19mm Compatible 30CH-RG-1956 Rose Gold Silver 19mm Compatible 30CH-1957 Stainless Steel Silver 19mm Compatible 30CH-AM-1958 Stainless Steel Silver 19mm Compatible

Dress JDM

JDM-DR-1990 Stainless Steel White 18mm Compatible

Elegant Automatic

L4.310.4.12.6 Stainless Steel Silver 18mm Compatible L4.910.4.92.6 Stainless Steel Blue 20mm Compatible

Evidenza Automatic

L2.642.4.73.4 Stainless Steel Silver 18mm Compatible

Evidenza Chronograph

L2.642.4.51.4 Stainless Steel Black 18mm Compatible

Evidenza Early

L2.643.4.51.0 Stainless Steel Black 21mm Compatible L2.642.4.73.3 Stainless Steel Silver Guilloché 20mm Compatible

Evidenza Moonphase

L2.643.4.78.6 Stainless Steel Silver 21mm Compatible

Flagship 12.68Z

Cal12.68Z-1958 Stainless Steel Silver 18mm Compatible

Flagship Anniversary

L4.746.4.72.4 Stainless Steel Silver 19mm Compatible

Flagship Auto

L4.974.4.12.6 Stainless Steel White 19mm Compatible

Flagship Early

Cal340-1958 Stainless Steel Silver 18mm Compatible

Flagship Heritage

L4.795.4.78.2 Stainless Steel Cream 19mm Compatible L4.795.4.52.0 Steel Black 19mm Compatible

Flagship JDM

JDM-FS-1997 Steel/Gold Cap Champagne 18mm Compatible JDM-FS-2003 Stainless Steel Silver 18mm Compatible JDM-FS-2004 Stainless Steel Black 18mm Compatible

Flagship Linen

Cal340-Linen-1962 Stainless Steel Silver Linen 18mm Compatible

Grand Prize

9712-1990 Stainless Steel Silver 19mm Compatible

Greenlander (original)

Greenlander-LONG-1945 Stainless Steel Black 20mm Compatible

Lindbergh 1990s

L2.601.4.11.0 Stainless Steel Silver 18mm Compatible

Lindbergh Hour

Lind-LE-YG-2002 18K Yellow Gold White 22mm Compatible

Longines 1954

L1954-ANNIV-2004 Stainless Steel Silver 19mm Compatible

Longines 30L

30L-1960 Stainless Steel Silver 18mm Compatible

Longines 5-Star

JDM-ADM-1994 Stainless Steel Silver 18mm Compatible

Longines A-7

A7-LE-2002 Stainless Steel White Offset 20mm Compatible

Longines Diver

L3.155.4.52.J Stainless Steel Black 20mm Compatible

Longines Earl

L2.919.4.71.2 Stainless Steel Grey 20mm Compatible

Longines Elegant

JDM-EL-2003 Stainless Steel Silver Sunburst 19mm Compatible

Longines Heritage

L1.611.6.75.2 Gold Cap Champagne 18mm Compatible

Longines Hour

Lind-HourAngle-1931 Stainless Steel White 22mm Compatible

Longines JDM

JDM-Prom-1995 Stainless Steel White 19mm Compatible

Longines Marine

MN-LE-2005 Stainless Steel Silver 19mm Compatible

Longines Silver

JUB-1905-2005 Stainless Steel Silver 20mm Compatible

Longines Sport

LSC-1994 Stainless Steel White 20mm Compatible L3.615.4.76.6 Stainless Steel Grey 20mm Compatible

Longines Weems

Lind-Weems-1937 Stainless Steel Silver 20mm Compatible

Military HS°

HS-Longines-1942 Stainless Steel Black 20mm Compatible

Military WWW

WWW-Longines-1945 Stainless Steel Black 18mm Compatible

Presence 38

L4.722.4.12.2 Steel Silver 19mm Compatible

Presence 40

L4.921.4.12.6 Steel Silver 20mm Compatible L4.921.4.52.2 Steel Black 20mm Compatible

Presence JDM

JDM-PRE-2001 Stainless Steel Silver 19mm Compatible

Professional Diver

L3.635.4.56.6 Stainless Steel Black 20mm Compatible L3.635.5.88.6 Steel/Gold Cap Champagne 20mm Compatible

Présence Automatic

L4.921.4.12.6 Stainless Steel White 20mm Compatible

Présence Quartz

L4.790.4.12.7 Stainless Steel/Gold Cap White 20mm Compatible

RAF 6B/159

6B-Longines-1940 Stainless Steel Black 18mm Compatible

Record 38

L2.821.4.76.2 Steel Silver 19mm Compatible L2.821.4.96.2 Steel Blue 19mm Compatible

Record 40

L2.821.4.72.2 Steel Silver 20mm Compatible

Record Heritage

L2.921.4.56.2 Stainless Steel Black 20mm Compatible

Saint-Imier Chronograph

L2.752.4.52.6 Steel Black 21mm Compatible

Saint-Imier Date

L2.563.4.78.6 Steel Silver 18mm Compatible

Silver Arrow

L2.834.4.72.2 Stainless Steel Silver 19mm Compatible

Skin Diver

L2.822.4.56.2 Stainless Steel Black 22mm Compatible

Tuxedo Chrono

TUX-LE-2008 Stainless Steel Black/White 20mm Compatible

USA Boutique

L2.784.4.96.0 Stainless Steel Blue 21mm Compatible

Ultra-Chron 1968

2221042 Stainless Steel Black 22mm Compatible

Ultra-Chron 2022

L2.836.4.52.6 Stainless Steel Black/Red 22mm Compatible

Ultra-Chron Classic

L2.836.4.52.9 Stainless Steel Black/Red 22mm Compatible

Ultra-Chron Dress

431-1969 Stainless Steel Silver 18mm Compatible

UltraQuartz

Cal6512-1970 Stainless Steel Silver 19mm Compatible

UltraQuartz Revival

ULTRAQ-1975 Stainless Steel Silver 18mm Compatible

VHP Chronograph

VHP-CHRO-1993 Stainless Steel Black 20mm Compatible

VHP Generation

VHP-G1-1984 Stainless Steel Silver 18mm Compatible VHP-G1-BLK-1985 Stainless Steel Black 18mm Compatible VHP-G2-1990 Stainless Steel Silver 19mm Compatible

VHP Gold

5345-VHP-1992 Steel/Gold Cap Champagne 19mm Compatible

Compatible smartwatches

Smartwatches to pair with your Longines

Wear your smartwatch simultaneously with your Longines via Smartlet One. Lug widths 18mm to 24mm natively supported.

View all compatible smartwatches →

Questions

Frequently asked questions

Does Smartlet work with Longines Spirit?+

Yes. The Longines HydroConquest uses 20mm or 22mm lugs depending on the case size, both natively supported by Smartlet. Smartlet replaces the original bracelet or strap and holds your Apple Watch or Samsung Galaxy Watch on the underside of the wrist. Both run simultaneously. No tools required.

Does Smartlet work with Longines HydroConquest?+

Yes. The Longines Master Collection uses 19mm or 20mm lugs depending on case diameter, both within Smartlet's native range. Smartlet installs via the spring-bar system in seconds and is fully reversible. The Longines case and movement remain completely untouched during installation.

Does Smartlet modify my Longines?+

No. Smartlet replaces the bracelet or strap via the standard spring-bar system, the same mechanism used for any strap change. The Longines case, crown, and dial remain completely untouched. Installation is reversible in under 30 seconds without any specialist tools or permanent modification.

Which lug widths does Smartlet support natively?+

Smartlet supports lug widths from 18mm to 24mm natively. Longines models use 18mm, 19mm, 20mm, or 22mm lugs across the HydroConquest, Master, Spirit, and Conquest families. All references in our database fall within the native range. No adapter or modification is required.

Join the movement

Three steps to both watches on one wrist

Other Longines models

Smartwatches to pair with your Longines

Frequently asked questions