POSMA D3 GPS Cycling Bike Computer Speedometer Odometer with Navigation, ANT+ Support Strava and MapMyRide (BHR20 Heart Rate Monitor and BCB20 Speed/Cadence Sensor Bundle Option Available) Box includes: cycling computer, manual, USB charger, bike mount, PC analysis software CD. Bike riding with GPS calculation, route recording and navigation. 6 Axis e-compass and g-sensor provide the reliable information without annoying manual calibration. 2.4G ANT+ communication: support ANT+ heart rate monitor, cadence sensor, speed sensor, combo sensor, power meter (the base model itself does NOT include these accessories). Exercise analysis PC software: support detail analysis of each workout, route review in google map and file export to GPX file to upload to popular platform e.g. STRAVA, MapMyRIde/MapMyRun. D series support mile display (mph) and km (kmh). LED backlight. Rechargeable battery. Waterproof IPX7. Battery life: 15 hours.