Built-in Bluetooth + Microphone, supporting hands-free calls. Safer and more convenient. Wirelessly transmit phone calls from Bluetooth mobile phone to the car FM stereo system. Switch to hands free model automatically from music playing status when receiving a call. With A2DP function, stream music from Bluetooth device to car's FM stereo system. Supports music playing from USB disk; Supports MP3/WMA format files. Draws power from the cigarette socket in the car. Dual USB outputs 5V/9V/12V, suitable for charging iPhone, iPad, iPod and other devices. Full 206 channels optional from 87.5-108MHz LED display the number. Redial the last call. Specifications: Item Type: Bluetooth FM Transmitter. Input Voltage: DC 12-24V Output Current: Dual USB Ports 5V/9V/12V FM Transmission Frequency: 87.5-108.0 MHz FM Transmission Distance: & 65308;5m Bluetooth Version: V5.0 Bluetooth Range: about 10m Microphone Effective Range: about 0.5-2m USB Audio Format: MP3 / WMA Compatible Model: Universal 12V-24V Vehicles Support Device: iOS & Android Screen Specifications: Blue LED Digital Display Warm Tip: The frequency range of our wireless Bluetooth FM transmitter is 87.5-108MHZ, so you can tune to the exact station on your radio and there's no need to worry about the frequency or static. Item Included: 1 x Bluetooth FM Transmitter