Specification:<br /><br />Bluetooth version: V4.0<br />Support: HSP・ HFP・ A2DP and AVRCP<br />Battery: 3.7v 75mAh<br />Frequency range: 2.4GHz<br />Operating distance: up to 10m(free space)<br />Talking/music playing time: about 6h<br />Standby time: 260h<br />Charging time: about 1.5h<br />Frequency response: 100-8kHz<br />Operating temperature: -10~65 <br />Color: black+green<br /><br /><br />Package contents:<br />Headphone*1<br />USB cable*1<br />Earplug*4(2 pairs・not including 2 on the earphone)<br />Ear stabilizer*2(not including 1 on the earphone)<br />User manual*1 <br />