Features: 1¡¢ Supports answering, redialing, rejection and ending call functions 2¡¢ Supports A2DP profile 3¡¢ Individual voice dialing 4¡¢ Integrated car music system 5¡¢ Supports integrated car MP3 function 6¡¢ Selects last 10 numbers dial-back from Bluetooth car kit 7¡¢ Built-in stereo speakers (3W) 8¡¢ FM radio earphones 9¡¢ Supports cell phone, MP3, iPod, U-disk, SD or MMC memory and other audio device 10¡¢ Individual wireless system provides private channel talking 11¡¢ Predominant FM radio transmission to enjoy high fidelity car stereo 12¡¢ Saves power 13¡¢ Human talking interface and operation 14¡¢ Switches between working states 15¡¢ Phone book function 16¡¢ Name display 17¡¢ Makes operating more easily " Specifications: 1¡¢ Bluetooth version: V2.0 2¡¢Working voltage: 12 to 24V DC 3¡¢ Frequency: 2.4GHz 4¡¢ Battery capacity: 1,700mAh 5¡¢ Standby time: 120 hours 6¡¢ Earphone battery capacity: 30mAh 7¡¢ Earphone working time: 2 hours 8¡¢ ID call: 12-digit digital display 9¡¢ FM radio frequency: 87.5 - 108.0MHz (optional) 10¡¢ Operating temperature: -20 to 70¡ãC