... 4.Distance:10M High-end & Cheapest Bluetooth Wireless headphone Built-in MIC, Headset for Mobilephone/iphone, mobile phone headphones FEATURES ... audiophile grade sound quality• High-sensitive, convient for the driver to chat anywhere• Long talking time:range up 9 hours ... EDR 3. GFSK(Gaussian Frequency shift keying)4. Bluetooth chip: CSR5. Bluetooth profiles supported: HSP,HFP,A2DP,AVRCP6.Talking time: ...