1. Bluetooth V2.0, Class 2 is compatible with the Headset, Hands-free And A2DP Profile. 2. Adaptive Frequency Hopping (AFH). Less susceptible to interference. Extensive reduction of disturbance from other radio technology, e. G. WLAN 3.10 meters work range. 4. Supports vocal dialing-If supported by the mobile phone. 5. Re-dial of the last dialed phone number. 6. DSP (Digital Signal Processor) to decrease noise and echo. 7. Full Duplex. 8. Rechargeable batteries AAA. 9. Display of the state of charge of the battery. 10. There is a second multifunction button on the microphone swivel handle; Therefore no adjustment is needed when the visor is in the down position. 11. The adjustable microphone swivel handle is able to adjust the microphone into best position, according to the users habit. The max working angel of microphone is 200 degrees. 12. Compatible with all Bluetooth competent mobile phones. 13. Firmware-Update possible. 14. Standby: One week (max. ) 15. Talk time: 9hrs (depending on the battery and the speakers volume). 16. Size (mm): 120 wide x 70 deep x 23 heights.