Boyo Vtg43 4.3 Inch Rearview Mirror Monitor with Built in Navigation, Built in Bluetooth, Touch Screen Controls, Sd Card Slot, Built in Fm Transmitter Rear-view mirror with built-in GPS navigation unit and Bluetooth receiver 4.3" touchscreen accesses navigation and other functions Front-panel controls for volume, Bluetooth, and switching sources FM transmitter sends signal to your vehicle's radio Built-in microphone and speaker