Combine rearview mirror and Bluetooth technology Full duplex, DSP technology for noise and echo cancellation. Independent FM earphone, taken away easily Support two profiles - Handsfree and Headset Super bright LED caller-ID display Easy fixing on the original mirror, no installation, no wire Up to 300 hours standby time; Up to 8 hours talking time Supply optional car or travel charger together with USB cable . Bluetooth Rearview Mirror FM Car kit supports three ways to handle your phone calls: 1. The voice comes through the built-in speakerphone 2. Via the detachable FM headset 3. Set the car kit and car radio with the same FM frequency, the voice comes through car radio. This is the Bluetooth-enabled rear view mirror that displays incoming caller name on the mirror screen and a removable wireless FM headset that allows handsfree communication or in-ear private use. Calls are automatically routed to the in-ear headset when it is removed from the mirror, and return to the speakerphone when the headset is placed back into its cradle. The device connects wirelessly to any Bluetooth compatible cell phones, allowing hands-free conversations without the use of any wires. The mirror clamps over your car's existing rearview mirror. It enables you handle phone calls in 3 ways: handsfree speaker,detachable FM earpiece and car radio receiver speaker (after setting the same FM frequency with car radio). This is the Bluetooth-enabled rear view mirror that displays incoming caller name on the mirror screen and a removable wireless FM headset that allows handsfree communication or in-ear private use. Calls are automatically routed to the in-ear headset when it is removed from the mirror, and return to the speakerphone when the headset is placed back into its cradle. The device connects wirelessly to any Bluetooth compatible cell phones, allowing hands-free conversations without the use of any wires. The mirror clamps over your car`s existing rearview mirror. It enables you handle phone calls in 3 ways: handsfree speaker,detachable FM earpiece and car radio receiver speaker (after setting the same FM frequency with car radio).