Overview: Built-in rechargeable battery powers the mirror/bluetooth (so mirror doesn't have to be constantly plugged into cigarette lighter socket) Dual operation modes: 1. Via Handsfree Loudspeaker & Mic, 2. Via Detachable Headset for private conversations (magnetically held on the right hand side of the mirror) Detachable headset operates on full duplex wireless radio frequencies & automatically gets recharged by re-attaching on to the mirror Caller ID & Name (for supported phones) are displayed right on the mirror so you can keep your eyes on the road Built-in FM Transmitter sends voice to your car stereo (4 FM frequencies available) Specifications: Mirror features full duplex, noise & echo cancellation, DSP technology Bluetooth specification: 1.2 Class 2 Built-in microphone & loudspeaker Super bright LED display panel for incoming call indication. Voice dial amp; redial Flip through your phone book Wireless headset, convenient for private conversation at anytime. Switch to Car Kit's Speaker easily Powered by swappable high capacity lithium battery (included) Manufacturer claimed standby time: Approx. one week (168 hours), talk time: 10 hours Cigarette lighter adapter included to recharge the mirror Dimensions: 11.54 in x 3.74 in x 1.85 in Weight: 31.89