Feature:1. With HD voice 2. Support DSP, Auto pairing 3. bluetooth 4.0 +edr, class 24. Support A2DP stereo profile 5. Easyinstallation 6. Standby time:up to 500 hours 7. Supports bluetooth hands-free 8. The device is connected via usb 9. Dual microphone (noise blackout)10. With the microphone mute function 11. Dual standby visor music bluetooth 12. Just clip & go-on installation, no programs, no wire 13. Hear your calls clearly with its dual microphone technology 14. Play your music & calls through the speakerphone of the receiver 15. With the HD microphone strengthening noise cancellation technology 16. Simple wireless connection to existing audio gear, compatible with any stereo line input Specification: Material ABSColor Black Size 11.5 x 6.5 x 2.0 CMThe Cable Length 150CMInput Voltage 3.7V 650m A Output Voltage DC5V-6V 400m A The Headset Power 2WPower 3WThe Speaker Power 2WThe Microphone Sensitivity-41db Frequency Response 60 Hz-18 K Hz Package Included:1 X bluetooth 4.0 Vehicle Speakerphone 1 X USB (Universal Serial Bus) Cable 1 X Iron Holder 1 X User Manual