Fashion and casual Smart Wearable Devices best partner of cell phone  anti-lost alarm . Pairing with Bluetooth  answer call by a button.</br>Specialty design elegant and fashionable  Easy to operate and convenient to wear.</br>"Vibrate when you have a call</br>"Caller ID and LED Time Display so you can see the phone number of the person calling instead of having to struggle opening your bag in a busy area you can instantly tell if the call is important or not.</br>"Time display. Unlike most wireless techniques bluetooth uses time division duplex to arrange the transmission slots so that it can avoid collision.</br></br>Product Description</br></br>The bracelet is charged through standard Micro USB input port. <br> Support play mp3 directly and music sync with smart phone.<br> Compatible with smartphones which use Google android For ios windows phone Nokia Symbian Blackberry OS systems. <br> <b>Specification </b><br> Shape of the dial: Arch <br> Display Type: Numbers <br> Screen: OLED capacitive touchscreen display <br> Pedometer: 3d gravity sensor gyro <br> Speaker: 0.9W <br> Microphone: 38 DB flat vibration motor: 8 x 2.7 mm <br> Bluetooth version: 3.0 <br> Battery capacity: 250mAh <br> Charge time: 2-3 hours <br> Standby time: 72 hours <br> Charging: DC 5V <br> Charging interface: Universal standard for micro USB <br></br><br/>http://www.amazon.com/gp/product/B00QNDZTEK