XOSS App Support Download XOSS App in iPhone App Store or Google Store.Paired with your smartphone,you can see the deatil information and analysis of your riding activites. Note: App require mobile phone with Bluetooth 4.0 or above. Sync to Strava Connect your Strava account with XOSS app to sync activities. For more details refer to the user mannual. Easy Installation Packaged with a standard mount, it"'"s easy to install on your bike. Automatic Backlight The backlight automatically turn on at night according to the time zone.You can shut this function down in XOSS app. Quad-Satellites System With GPS, BeiDou,GLONASS and Galileo satellites,it"'"s faster and more accurate than ever.You will never get lost on earth. Built-in Barometer With a built-in barometer, you"'"ll know how high you"'"ve ridden on the longest climbs or on your way through the city. IPX7 Waterproof IPX7 waterproof. It can be used on Rainy days when the USB plug is on, please dry immediately after use. Long Battery Life Rechargeable lithium Battery. A single charge lasts up to 25 days on the basis of 1 hr continous operation per day Aerodynamic Design Using aerodynamic as design concept, the shape of XOSS G can reduce the pressure drag during your riding.