Specific:<br />Material: Steel + Silicon<br />Bluetooth Version: Bluetooth V2.1<br />Bluetooth Protocol: A2DP + HFP 1.5 + HS P 1.2<br />Range of Frequency: 2.4GHz spectrum<br />Ambient Noise: 75dB<br />Transmitting Range: Approx 10m<br />Language:Support multi-language<br />Charging Time: about 1 hour<br />Talk Time: about 4 hours<br />Music Play Time: about 6 hours<br />Standby Time: about 190 hours<br />Power Supply: Built-in 230mAh rechargeable battery<br />Dial Size: 5.02 x 4.82 x 1cm / 1.98 x 1.9 x 0.39inch<br />Watch Band Length: 25cm / 9.84inch<br />Watch Band Width: 2.6cm / 1.02inch<br />Support version : Android 2.3 and above<br /><br />feature:<br />1・Sync music<br />2・Sync phone clock to watch<br />3・Sync 1000 phonebook・ 200 call log・ 10 SMS<br />4・With pushing message・ such as MMS・ QQ・ Wechat・ news title・Calendar events・ etc<br />5・Can connect to all BT phone and tablet<br />6・Support hands-free calls<br />7・Play the music in your phone (after Bluetooth paring)<br />8・Anti-lost alarm function: When cellphone left watch alarm automatically・ after a certain distance to avoid lose the phones.