Wear a Smartwatch with Your Cartier | Smartlet

Yes. The Santos de Cartier Medium and Large use 20mm lugs, natively supported by Smartlet. The Santos Small uses 18mm lugs, also within the native range. Smartlet replaces the Santos interchangeable strap and positions your Apple Watch or Galaxy Watch on the underside of the same wrist. No tools required.

Yes. The Tank Must uses 19mm or 20mm lugs depending on size, both natively supported. The Tank Solo and Tank Louis Cartier also fall within the 18–20mm range. Smartlet installs via the standard spring-bar system and is fully reversible. Both watches run simultaneously on the same wrist.

No. Smartlet installs via the standard spring-bar system, the same mechanism used for any strap change. The Roman numeral dial, signature crown, and polished case remain completely untouched. The installation takes under 30 seconds and is fully reversible without any specialist tools.

Smartlet supports lug widths from 18mm to 24mm natively. Cartier models use 18mm, 19mm, or 20mm lugs depending on the reference and size. All Cartier references in our database fall within this native range. No adapter or modification is needed to install Smartlet on your Cartier.