【Dual USB Charging Ports】: QC3.0 and 5V/2.4A charging ports, 5V/2.4A and QC3.0, provide fast charging and support 2 devices charging at the same time, with over-charging protection. 【Hands-Free Calling】: This Bluetooth FM transmitter is designed with advanced Bluetooth 5.0 wireless noise-canceling quality chip, making it possible to connect stably and make clear calls. 【4 Playback Modes and 7 EQ Modes】: Support Aux/Bluetooth/USB/TF Card. Aigital car radio transmitter features advanced interference and noise cancellation technology - CVC technology produces full-duplex sound and suppresses noise and wind. 7 EQ modes meet your more taste in music, enjoy your favorite music easily. 【Safe and Easy Setup】: This FM transmitter is equipped with a voltmeter, you can detect the condition of your car battery. Just plug this car bluetooth fm transmitter into the cigarette lighter to power on, adjust the car frequency to be the same as the product frequency, connect the phone bluetooth to "T831".   IC: 6955A-FMTD10, HVIN: FMTD10, PMN: FM Transmitter, Frequency Range: 88.1-107.9MHz