Specification:<br /><br />Wireless Version: V4.1 + EDR<br />Support Agreement: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3<br />Frequency: 2.4GHz<br />Impedance: 32 OHM<br />Transmission: class2<br />Output power: 30mW<br />Range: 33feet<br />Frequency response: 20-20000Hz<br />Talking Time: 3-4 hours<br />Charging time about 1 hour (power indicator charging: red light; full power: red light off ｣ｬblue light on)<br />Standby Time: 120 hours<br />Battery: 60mAh rechargeable Li battery<br />Operating voltage range: 3.0V-4.2V<br />Mitou sensitivity: -42dB<br />Product Size: Length 25MM* Width 15MM*High 35 MM<br />Charging power: DC5V power supply [round hole interface] (computer USB port｣ｬ mobile phone charger｣ｬ car charger)<br />Compatible phone: compatible with almost all the Android｣ｬ Apple｣ｬ Microsoft｣ｬ Saipan system with Bluetooth mobile phone<br /><br />Package Content:<br /><br />1*Bluetooth Headphones<br />1*USB Charging Cable<br />1*User Manual<br /><br />FAQ:<br />Q: How to connect the device? A: First time connection｣ｬ short press the power button until the led flash in blue and red alternately ｣ｬ then turn on your smartphone to search available device( HBQ-i7) ｣ｬ then you could listen to music and make calles.<br />Q: About charging and battery life?<br />A: Using the Nokia mini-charging interface｣ｬ fully charged the battery in 80 minutes. When taking charge｣ｬ the led would be in red｣ｬ and turns in blue when fully charged.<br />Note: This product is a sing