Espruino Bangle.js v2 - Hackable Javascript Smart Watch is an open, hackable smartwatch with a sunlight-readable always-on screen, 4-week battery life, complete flexibility, and full control over your data. It offers a refreshing alternative to expensive smartwatches.You can install new apps from the web or develop your own using JavaScript. All you need is a Web Browser (Chrome, Edge, or Opera), and you can upload apps or write code wirelessly to run on your watch! Bangle.js is waterproof and includes Bluetooth® Low Energy, GPS, a heart rate monitor, accelerometer, magnetometer, pressure sensor, and more.Bangle.js 2.0 specs: IP67 Waterproof (max 1 meter for 30 minutes). Please note: IP67 does not mean you can wear it while swimming. Nordic 64MHz nRF52840 ARM Cortex-M4 processor with Bluetooth® LE 256kB RAM, 1MB on-chip flash, 8MB external flash 1.3 inch 176x176 always-on 3-bit color LCD display (LPM013M126) with backlight Full touchscreen (6H hardness glass) GPS/Glonass receiver Heart rate monitor 3 Axis Accelerometer 3 Axis Magnetometer Air Pressure/Temperature sensor Vibration motor 200mAh battery, 4 week standby time 36mm x 43mm x 12mm watch body, with standard 20mm watch straps Full SWD debug port on back of watch