⚡ Azume One: 2.8mm sensor for wristwatches

Azume, a Munich-based startup, has launched the Azume One, a compact health tracker designed to attach to the back of regular wristwatches. The device enables heart rate, sleep, stress, and activity monitoring without requiring a dedicated smartwatch. It is currently available through a crowdfunding campaign.

The Azume One measures 30mm in diameter, is 2.8mm thick, and weighs 5 grams. It features an optical PPG sensor for heart rate and blood oxygen monitoring, alongside a motion sensor for activity tracking. Skin temperature is also monitored. Data is transmitted to Android or iOS smartphones via Bluetooth 5.4. The unit offers up to 48 hours of battery life.

Mounting is achieved through a removable nano-suction system, allowing users to switch between watches. An included wristband supports sleep tracking without wearing a watch. The device lacks a display, vibrations, or notifications, and requires no subscription. The MCU is not specified, though it is potentially based on Nordic Semi nRF52 hardware.