Description:<br />Bluetooth version: V4.1<br />Working Voltage: 3.2V - 4.2V<br />Sensitivity: -42dB 2dB<br />Frequency Range: 2.4-2.48Ghz<br />Talk/Listening time: Up to 120 minutes listen or talk<br />Standby time: Up to 8 days<br />Auto Power-Off technology: Power off when no connectivity for 5 minutes.<br />Operating distance(range): Up to 10m/33 feet<br />Headphones weight: 5 grams per earbud<br />Noise reduction: Full duplex echo cancellation; Real time noise reduction; Voice <br /><br />clarity<br />Moisture protection: Design for sweat and moisture protection<br />Charge connector: Micro USB charging<br />Battery type: Rechargeable・ non-replaceable lithium-ion polymer<br />Bluetooth 4.1 + EDR: Advanced Audio Distribution Profile (A2DP)・ Audio Video Remote <br /><br />Control Profile (AVRCP)・ Hands-free Profile (HFP) and Headset Profile (HSP)<br /> <br />Note:<br />When charging・ red light is on; When finished charging・ light off; When headset is put <br /><br />in the charging case・ hedset will be powerd off automatically; When several minutes <br /><br />after the low battery alert・ headset will be powerd off.<br />More instructions in the User Manual<br />Package included:<br />1(2) x Bluetooth Stereo Earbuds<br />2(4 )x Earcaps<br />1 x Charging Station<br />1 x Micro USB charge cable<br />1 x User Manual