Here is a smartwatch made with coders in mind. The Bangle.js v2 is an open, hackable smartwatch that lets you install new apps from the web and develop your own. It has a Nordic 64MHz nRF52840 ARM Cortex-M4 processor with Bluetooth LE, 256kB RAM, and 1.3-inch LCD display with backlight, GPS/GLONASS receiver, and heart rate monitor.
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The Bangle.js v2 lasts up to 4 weeks on standby. It comes with various sensors, including an accelerometer and magnetometer. It also has a vibrating motor.
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