Smartlet One Shadow was built for explorers and adventurers.
Forged in Paris from sandblasted black SS316L stainless steel, Shadow embodies quiet strength and refined discretion. Its matte surface absorbs light, giving it a presence that is subtle and understated — yet impossible to ignore. From an early-morning climb to a late-night bar, it adapts seamlessly: rugged enough for the outdoors, refined enough for the city.
With its patented modular system, Smartlet unites tradition and technology on a single wrist. Your classic watch stays protected and ready, while your smartwatch or fitness tracker delivers the data and connectivity you need — without compromise, and without ever breaking your rhythm.
Key features
- Forged in sandblasted black SS316L stainless steel
- Matte finish that absorbs light — discreet yet distinctive
- Water-resistant and engineered to endure daily challenges
- Patented locking system for security and comfort
- Compatible with leading smartwatches, fitness trackers, and from 18mm to 24mm lug widths watches (see below)
Delivery: Delivered in 3 to 7 days depending on the geography
Classic watches, smartwatches, or fitness trackers are not included. Please check compatibility below before ordering.
Our clients love Smartlet
Smartlet gave me the opportunity to enjoy my beloved timepieces, while monitoring my heart condition with my Apple watch. The product exceeds my expectations.
Steve
Orange, CA
As an airline pilot, I am always on the run. Smartlet gives me the ability to wander across the world with my mechanical watches, while enjoying the benefits of technology. I am a fan!
Rod
Chicago, Il
First, I want to applaud the team for taking what appears to be a simple idea and realizing it at such a high level. Smartlet was worth the wait, and perhaps precisely because we waited, the product reached such an impressive level of refinement.
Mizuki
Tokyo, Japan
I am highly satisfied with the performance and design. I honestly expected greater restriction or discomfort given its function, but the daily wear has been surprisingly smooth. Furthermore, the look and finish of the strap itself are excellent.
Maxim
Prague, Czech Republic
I am very impressed with it and have received positive comments about how unique it is.
Josh
Tupelo, Mississippi
FAQ
Questions about Smartlet One
What is Smartlet One?
Smartlet One is a patented modular watch strap engineered to fit any metal watch with a lug width between 18mm and 24mm - the widest compatibility range on the market. It lets you wear a mechanical watch and a smartwatch simultaneously on the same wrist, with no modification and no tools.
Which watches are compatible with Smartlet One?
Smartlet One is compatible with any metal watch using a standard lug width between 18mm and 24mm, including Rolex, Omega, Tudor, Breitling, IWC, Seiko, TAG Heuer, Panerai, Jaeger-LeCoultre, Blancpain and 17 other brands. For smartwatches, it supports Apple Watch (all series), Samsung Galaxy Watch, Garmin Fenix, Garmin Forerunner, Polar Vantage, Whoop, and more.
How is Smartlet different from a regular watch strap?
Before Smartlet, you needed one strap per watch. Smartlet One reverses that logic: one strap for any combination. Two mechanical watches, two smartwatches, or one of each - you choose. A patented dual-carrier system compatible with 18mm to 24mm lug widths, switching in 3 seconds with no tools. The only patented product in this category, awarded at Concours Lépine 2025 and selected for CES 2026.
Wear it your way
Designed to be intuitive, your Smartlet is ready to wear in moments. Discover how to pair it with your favorite watches and smartwatches.
Technical specifications
What's in the box?
Smartlet includes
- 2 x standard watch connectors (from 18 mm - to 24 mm lug width watch)
- 2 x bracelet sides (mounted with 5 links)
- 4 x additional links for size adjustments (with screws)
- 1 x standard Clasp
- 1 x Smartlet tool ( bracelet removal system)
- 1 x Screwdriver
For the smartwatch / fitness tracker connector (depending on the version selected)
- 2 x standard watch connectors (from 18 mm to 24 mm lug width watch)
- 2x adapters for Apple watch (38/41mm and 42/44/45/49mm)
- 2x adapters for Fitbit Charge 5/6
- 1x adapter for Whoop 5.0 / MG
Smartlet doesn't include any classic watch, smartwatch or fitness tracker, they need to be bought separately.
Dimensions
Material: Stainless steel SS316L or Titanium Grade 2
Weight: between 60 g and 100 g (including connected device)
Height: between 9 mm and 12 mm on the wrist back (including connected device)
Width: between 18,5 mm and 36 mm (including connected device)
As a benchmark, standard stainless steel bracelet on the market specifications:
- Weight: between 60 g and 100 g (same as Smartlet with connected device)
- Height: between 4 mm and 8 mm on the wrist back
- Width: between 18 mm and 22 mm
Smartlet One
The freedom to wear all your watches on one wrist
Smartlet One Accessories
Smartlet was born from a simple idea: freedom of choice. Your watch tells your story, heritage, performance, or daily tracking. With our connectors, you never compromise: integrate, adapt, expand.
How to use your Smartlet?
How to use
How to assemble your Smartlet
How to use
How to wear your Smartlet
How to use
How to remove your Smartlet
Preview your unboxing experience
Standard packaging
The gift of choice
A Smartlet gift card lets them pick the perfect match for their favorite timepiece.
Our magazine - On the wrist View all
