... 4.Distance:10M High-end & Cheapest Bluetooth Wireless headphone Built-in MIC, Headset for Mobilephone/iphone, mobile phone headphones ... Functions: Answer/End/Reject/Transfer a call, Call waiting, Call redial, Voice dial, • Strong compatibility,can pair for most of bluetooth ... 3. GFSK(Gaussian Frequency shift keying)4. Bluetooth chip: CSR5. Bluetooth profiles supported: HSP,HFP,A2DP,AVRCP6.Talking time ...