1、BT 5.0: The FM transmitter car adapter has BT5.0 function, with hands free calling, with automatic power off memory function 2、5V 3.1A: The radio transmitter car charger has a high current car charger interface, which can provide a maximum charging current of 5V3.1A for multimedia (mobile phones, tablets, etc.) 3、USB Interface: The FM transmitter for car has a USB data interface, which can also be used as a charging interface when using a dedicated charging cable 4、Glossy Call: The USB car charger has aftersound cancellation and noise processing functions during calls, with stereo BT and FM transmission technology 5、Supported Functions: The car transmitter radio adapter supports USB, memory card, BT functions, supports MP3, WAV format music, with voltage detection and colorful lights Item Type: FM Transmitter Car Adapter Material: Plastic, Electronic Interface: USB2.0 Support Memory Card Maximum Capacity: 32GB Power Supply: DC12 to 24V Supported File Types: MP3, APE, FLAC, WAV, WMA Working Current: DC12V 50 to 100ma Bit Rate: 64 to 320kbps FM Frequency Range: 87.5 to 108MHz Signal to Noise Ratio: 85dB Operating Temperature: 0 to 60 Degrees Celsius BT Version: V5.0 and EDR Transmitting Distance: Less Than 5meters/5.5yd 1 x FM Transmitter Car Adapter 1 x User Manual