*Wireless bluetooth V4.1 headset

*Protein earcap

*Support: A2DP/AVRCP/HFP/HSP

*Working distance: 10m

*Battery capacity: 500mAh 3.7v

*Charging time: about 2h

*Speaker size: Φ40mm *8.5 mm(H)

*Speaker sensitivity:98dB±3dB at 1KHz

*Speaker impedance:32±15% OHMS

*Speaker response frequency: 20Hz-20KHz

*Mic size: Φ4.0mm * 1.5mm(H) 

*Mic sensitivity: -42±3 dB 

*Mic impedance: 2.2KOHMS

*Mic frequency response:100~10KHz

*Total Harmonic Distortion:  ≦ 5%/10%(Speaker/Mic)

*Almost one week of use with HIFI sound: professional 40mm drivers offer you incredible listening clarity. Supplying up to 30 hours of rechargeable battery life, twice as much as others. If not used frequently, headphone can be used about a week. 3. 5mm audio cable changes the wireless to wired mode to keep listening when the battery runs out. 

*3-Button easy CONTROL on music, calls, audio books & FM: quickly connecting with Bluetooth V4. 1 to your phones, you can operate all the audio and call function directly on the headphones without touching your cellphones to enjoy your things. 

*Rotatable space-saving design with travel Carrying bag & proper tightness in light weight for comfort: Take it to anywhere with the included carrying bag. The ergonomic design, comfy memory protein earmuff and the adjustable metal slider reduces pressure on ear and fit head perfectly. 

*Hands free calling: Built-in microphone lets you pick up any incoming calls conveniently. No need to worry about missing any phone calls. 

*Stable compatibility & easy to use: compatible with most Bluetooth devices. Quickly and stable connecting with your smartphones, MP3, iPad, PC, laptop and so on.