Compatibility Compatible with i OS 6.1 or above; Android system 4.3 or above; Bluetooth version 4.0 Tracking steps Your private management experts, help you monitor the daily movement, always check the number of steps, helping you to achieve your health goals. Distance measurement Measure you daily walking distance precisely. Calorie consumption management Measuring the calorie burned when you doing exercise. Sleep cycle To monitor the quality of your sleep, let you know whether you have a good sleep. Reminder Setting reminder for drinking, taking medicines, meeting, sitting for too long or other customized alarm. Call reminder When incoming calls are not answered in a certain time, U TERRA will remind you by vibration (Now only support Android phones). Message reminder When new message arrived, U TERRA will remind you by vibration, in that case you wil not miss any timely message (Now only support Android phones). Time display Sync your smart phone will display time. Regular service 240 hours About 240 hours standby time, say goodbye to charge every day. IP68 Water Resiatant Wear U TERRA to swim or dive, you will not loss any important call. Download App Andriod mobile phone you can install