Vision Tech VTB88 Bluetooth CallerID Earpiece Rear View Mirror The VTB88 Car Kit is a Bluetooh Hands-Free mirror with an additional portable Bluetooth headset adap Optimized DSP for improved Call quality and supports Voice Dialing(if supported by your handset) All-In-One Bluetooth Rear View Mirror and Ear Piece Last number Redial Built-in Li-Ion rechargeable battery that last for a week (standby)