Have a happy shopping! Bluetooth4.0 Battery50mA Polymer Lithium-ion Charging Time1 hour Standby time 7 days or so Working hours 3-5 days WaterproofLife Waterproof Operating Temperature-10 to 45 Storag more→e Temperature-20 to 60 Support IOS 7.1 and Android 4.4 or above Synchronization Range3mtheoretical rang is 10m without any interference 1. Multi Functions SMS, information, call reminders, Heart rate monitor and blood pressure monitor, Sleep monitor, check sleep trend chart to view your sleep time and quality. 2. Convenient Bluetooth synchronization, and the data synchronization does not require cable. When the Bluetooth is disconnected or the phone is out of the Bluetooth distance, the watch