Smartlet FAQ: Compatibility, Features & Wear

Smartlet is a patented modular watch bracelet, designed and engineered in Paris, that lets you wear a classic mechanical watch and a smartwatch or fitness tracker simultaneously on the same wrist. The system uses precision quick-release connectors. Your classic watch sits on top, your smartwatch underneath. Awarded Bronze Medal at Concours Lépine International Paris 2025. Selected for CES 2026.

Until Smartlet, watch enthusiasts had to choose between their mechanical watch and their smartwatch. Smartlet eliminates that compromise with a patented dual-carrier bracelet that holds both timepieces simultaneously on the same wrist.

Yes. Smartlet created the modular dual-watch bracelet category, it is not a watch strap replacement, not a smartwatch band. It is a wrist system accommodating two timepieces at once and managing multiple lug widths, combining watchmaking precision with modern modularity.

Watch lovers who also live a connected life, professionals who want discretion (smartwatch hidden under wrist in meetings), athletes who track health data without sacrificing their heritage timepiece, and collectors who no longer have to choose which watch to wear.

Smartlet's patented system uses precision-engineered connectors attaching to your classic watch's lugs and your smartwatch's band attachment points. Classic watch on top of wrist, smartwatch underneath. No tools required for daily use.

Approximately 3 seconds. Smartlet's quick-release connectors allow tool-free swapping between any compatible watch and smartwatch at any moment.

Yes, from underside impacts (walls,
doorframes). It does not protect the smartwatch crystal from flat surface impacts. Screen protectors recommended for very valuable pieces.

Smartlet is designed for everyday wear and handles light activity with ease.For more intensive workouts, whether at the gym or outdoors, we recommend using a fabric or rubber strap, which offers better support and comfort during high-intensity training.

Any metal watch with lug width 18mm–24mm: Rolex (Submariner, GMT-Master II, Sea-Dweller, Datejust), Omega (Seamaster, Speedmaster), Tudor (Black Bay, Pelagos), Tag Heuer (Monaco, Carrera), Zenith (Chronomaster), Breitling, IWC, Longines,
Seiko, Tissot, Hamilton, and many others.

Lug width is the distance in mm between the two attachment points on the watch case. Measure with a digital caliper across the inside of the lugs. Common sizes: 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm. Always listed in manufacturer technical specifications.

No. Watches without removable spring bars (some AP Royal Oak, Patek Nautilus configurations) are not compatible with Smartlet.

Apple Watch (Series 1–11, SE, Ultra 1-3), Samsung Galaxy Watch (40/41/44mm - some with adapters), Google Pixel Watch (41mm/45mm with adapters), Garmin (all models 18–24mm lug width,
including Fenix 8, Vivoactive 5...), Fitbit Charge 5/6, Whoop 5.0 / MG, Huawei Watch Fit 2/3, Xiaomi Redmi Watch 3/4. And many others using standard lug widths.

Yes. Smartlet's modular connector system is upgradeable. New adapter sets are released as new smartwatch models arrive, no need to replace the bracelet, only the relevant adapter.

Classic and Shadow: SS316L surgical-grade stainless steel (same as medical devices and luxury watchmaking). Titanium: Grade 2 Titanium, aerospace-grade, 40% lighter than steel, naturally hypoallergenic, satin grey brushed finish.

Weight: 60–100g (same as standard steel
bracelet).

Height on wrist: 9–12mm (vs 4–8mm standard).

Width: 18.5–36mm.

Lug width compatibility: 18–24mm.

The Smartlet Bracelet includes:

2 x standard watch connectors (for any watch with a 18 mm to 24 mm lug width depending on the version chosen)

2 x bracelet sides (each mounted with 5 links)

4 x additional links for size adjustments (with screws)

1 x Smartlet tool (with wristband removal system)

1 x Standard 1,2mm screwdriver

For the Smartwatch connector (depending on the version):

2 x standard watch connectors (18mm to 24mm lug width),

2 x Apple Watch adapters 38/40/41mm,2 x Apple Watch 42/44/45mm adapters,

For Fitbit Charge connector: 2 x connectors for Fitbit Charge 5/6

For Whoop 5.0/MG connector: 1 x encapsulation for Whoop 5.0/MG

Smartlet does not include any classic watch, smartwatch or connected bracelet, they must be purchased separately.

No, Smartlet is designed to work with your existing devices.

Smartlet features a patented locking system with dual-action unlocking, ensuring your watches remain securely fastened during any activity.

Smartlet protects your smartwatch or fitness tracker from walls, but not from flat surfaces like tables or desks. These devices have reinforced screens that are extremely durable, but if you want to be even more careful, we recommend purchasing screen protectors for extra security.

Yes! Smartlet adds smart features without the added bulk, while remaining lightweight and comfortable for everyday use. Including compatible smart devices, the weight remains in the same range as most steel bracelets on the market, between 60 and 100g, and the thickness is between 9 and 12mm (compared to 4 to 8mm for conventional watches).

Clean it regularly with a soft cloth. Avoid prolonged exposure to water or chemicals to maintain its finish.

Smartlet can be purchased on www.smartlet.io, as well as in selected distributors and marketplaces.

14-day return from delivery date, original
condition required.

2-year product warranty against manufacturing defects. Does not cover accidental damage or normal wear.

Contact hello@smartlet.io for claims.

Designed in Paris by David Ohayon, CentraleSupélec engineer. Awarded Bronze Medal at Concours Lépine International
Paris 2025 (founded 1901, one of the world's oldest invention competitions).
Selected for CES 2026 in Las Vegas.

Contact us via our online form or our customer service, available Monday to Friday, 9am to 6pm CET. (by email: hello@smartlet.io or on Whatsapp)