Garmin Smartwatch Forerunner 55 GPS Black Specifications: Application: Cycling, Running, Swimming, Triathlon, Outdoor Navigation: no Operation: buttons Speed: GPS Heart Rate: Wrist measurement, heart rate chest sensor (optionally available) Accelerometer: yes (step frequency, vertical movement, ground contact time, swim analysis) Sensor Connectivity: ANT+, Bluetooth Data Transfer: Bluetooth, USB Technical Information: Size: 42 x 42 x 12 mm Display Size: 26 mm diameter Display Resolution (W x H): 208 x 208 pixels Display: multi-coloured Power Supply: lithium-ion battery Battery Life: up to 14 days in smartwatch mode, up to 20 hours in GPS mode Waterproof: yes (5 ATM) Satellite Systems: GPS, Galileo, GLONASS Alerts: Acoustic, Vibration Functions: Smartphone notifications, accident notifications https://buy.garmin.com/en-GB/GB/p/741137#specs