Adafruit Bangle.js v2 - Hackable Javascript Smart Watch

Bangle.js 2 is an open, hackable smartwatch that empowers you to take control of your tech. With a sunlight-readable always-on screen and a 4-week battery life, it's designed for those who crave efficiency and adaptability. Its extensive customization options allow you to install new apps directly from the web or create your own using JavaScript—all through a basic web browser.

Waterproof up to 1 meter for 30 minutes, the watch includes a robust set of features like Bluetooth® Low Energy, a GPS/Glonass receiver, a heart rate monitor, and multiple sensors for accelerometry, magnetometry, air pressure, and temperature. A full touchscreen, protected by 6H hardness glass, ensures durability along with interactivity in any situation.

Key specifications include a Nordic nRF52840 ARM Cortex-M4 processor, 256kB RAM, 1MB on-chip flash, and an additional 8MB external flash. The stunning 1.3 inch, 176x176 LCD display offers clear visuals complemented by a vibrant backlight, all housed in a 36mm x 43mm x 12mm body with standard 20mm watch straps.