Specifications:
1.  Bluetooth Version: V4.0, Chipset: CSR
2.  Support Profile: HSP V1.2,HFP V1.6,A2DP  V1.2,AVRCP V1.4
3.  Transmission distance: 10M
4.  Plug type: Ф3.5mm stereo
5.  Frequency Response: 20Hz-20KHZ
6.  Build-in speaker mic
7.  Speaker: Ф40mm.
8.  Impedence: 32Ω
9.  Rated Power: 50mW
10.Max Power: 100mW
Functions:
1. Allow 2 Bluetooth devices connected simultaneously
2. Support APTX,AAC nondestructive sound transmission standard Bluetooth 4.0 Headset 
3. Able to answer and reject the incoming call
4. It comes and combines wireless & wired in one
5. Never worry about the power consumption as a wired headphone
6. HIFI timbre and HIFI Stereo sound quality
7. Convenient foldable headband for easy carrying
8. Large, breathable cushioned ear cups and an adjustable headband for complete comfort and luxury
9. Compatible with most of bluetooth enable audio devices,including computer/laptop and Bluetooth enabled mobile phone,MP3/MP4,IPOD,PAD,etc.