Gorgeous time watch that is also a Bluetooth caller ID. It is as much a bracelet as it is a watch. So in design-wise and so in technology-wise. The OLED screen displays time but also lets you know who is calling you. This gadget also let you know whenever your phone has been stolen or lost: when it gets farther than 20 meters, the watch vibrates. It vibrates to alert you when you are receiving a call as well. You may even reject the call from the watch if you do not feel like picking up your cellphone from the bottom of your bag!Fashionable, stylish and so convenient!Included: rechargeable Lithium batteryColor: Black and WhiteBluetooth version: 2.1Voltage: 3.6V-4.2VCurrent: 130mAFrequency: 2.4GHzInput Voltage: 110~240VFrequency: 50HzInput current: 0.15AOutput Voltage: 5.7VOutput current: 600mACharge time: 2 hoursStandby time: 72 hours maximumBattery: lithium polymer