Features: 1.BT Function: The FM transmitter car adapter is BT version 5.0, supports BT calling, BT music transmission, and incoming call voice reporting 2.Scope of Application: The radio transmitter car charger is compatible with for iOS and for Android systems, suitable for most 12V to 24V vehicles, such as cars, minivans, etc 3.3 Play Modes: The USB charging car charger supports USB, memory card, BT 3 music playback modes, supports MP3 and WMA format music, and has playback memory function 4.128GB U Disk : 128GB The FM transmitter's memory card and U disk support 128GB to read music, with USB1A charging, USB2.1A fast charging 5.Display Screen: The car charger has a digital tube display screen. The screen only displays the frequency. After switching, the car charger can display the voltage, memory frequency point and music playback function. With FM transmit frequency 87.5 to 108.0MHz specification:Item Type: FM Transmitter Car Adapter Material: ABS BT Version: 5.0 and EDR BT Sound Processing: A2DP BTMicrophone Effective Distance: 0.5 to 2meters/0.5 to 2.2yd BT Transmission Distance: 10meters/10.9yd Display:Digital Tube Display Memory Card and U Disk: Support Up to 128GB USB Charging: USB1: 1A and 128GB to Read Music USB2: 2.1A Music Format: MP3, WMA Format FM Transmit Frequency: 87.5 to108.0MHz Working Voltage: 12 to 24V Working Temperature: 0 to 40C Distortion: 60db PackageList:1 x FMTransmitterCarAdapter 1 x User Manual