# Heir Universal Fitness Module: Seamless Integration with Screenless Mechanical Watches
The Heir module from startup Ganance attaches to the caseback of standard wristwatches using a micro-suction cup. It's 30 mm in diameter, 3 mm thick, and weighs just 5 g. With no screen or magnets, it won't interfere with the watch mechanism. The battery lasts up to 42 hours with standard charging. Data on steps, distance, and calories syncs to the Ganance iOS app, which integrates with Apple Health.
Notifications arrive via vibration with three intensity levels. Music controls: one tap pauses, two taps skip the track. Switching to different watches takes seconds—no tools required.
Technical Specifications and Compatibility
The device is designed for men's watches with a compatible caseback diameter. Ganance also released the HeirBand strap for standalone use—the module simply slots into it.
| Parameter | Value |
|----------|-------|
| Diameter | 30 mm |
| Thickness | 3 mm |
| Weight | 5 g |
| Battery Life | 42 hours |
| Features | Steps, distance, calories, vibration notifications |
| Integration | Apple Health, Google Health Connect coming soon |
The first batch has shipped to users. Reviews have noted inaccuracies in the step counter and Bluetooth connection stability. Developers promise fixes in the second version.
Ecosystem Development and Plans
The app is currently iOS-only. An Android version is expected in June with Google Health Connect support. This will enable syncing data with popular Android fitness services.
- Current features: tracking basic activity metrics, media controls, notifications.
- Update plans: expanding features, improving step counter accuracy, resolving connection issues.
- Accessories: HeirBand for standalone wear.
Previous similar products from Hodinkee and Trivoly failed to gain traction due to reliability issues. Heir skips the screen, focusing on simplicity and compatibility.
Competing Solutions
Ollee Watch offers a module for retro Casio F-91W and A158W watches. It adds an LED display, heart rate monitor, step counter, and mini-games. Unlike Heir, it's a specialized solution with a screen aimed at digital watches.
Key Points
- Heir doesn't interfere with mechanical watches thanks to no magnets and minimal weight.
- 42 hours of battery life without a subscription, with data integration into Apple Health.
- Quick swaps between watches or use with the HeirBand strap.
- Early reviews highlight step accuracy and Bluetooth issues—updates expected.
- Price: $150 for the module, $40 for the strap; shipping this spring to USA, Canada, UK, Europe.
— Editorial Team
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