Features   Dual USB ports  Dual USB ports allow you to listen to music while charging. The fast charge output gives you a fast and efficient charging experience. You can connect two mobile phones at the same time, automatically switch to the incoming call when you call  Smart Bluetooth 5.0 Technology  Smart Bluetooth 5.0 chip, compatible with Android, IOS system, using CVC noise cancellation technology to provide clear sound, when the power is turned on, the memory function will be automatically connected to the last paired Bluetooth device. Two ways to use (clamp/paste), stable and not falling off  Hands-free Revolution  Support hands-free calling, safe driving. With the buttons on the Bluetooth FM transmitter, you can easily control the call, music, volume, frequency and playback mode. Power-off memory playback, the transmitter will continue to play from the broken song when it is turned on  Intelligent detection voltage  LED screen display voltage level (real-time monitoring of car battery voltage, the voltage is lower than 12V when the car is not started, please check the battery as soon as possible. Adapt to 12-24V models such as cars, trucks, and neutral trucks  Other functions   The music of the mobile phone, TF card can be played to the car audio system via Bluetooth. Aux-in makes it possible to stream music from MP3, MP4 and other audio devices with 3.5mm ports. Built-in ambience light button, multiple color changes, short press light color switch      Specifications  Type: Car FM Transmitter  Quantity: 1 pc  Material: PP+ Metals  Color: Black  Rated working voltage: 12V~24V  Extreme working voltage: 8-27V  USB1 output: 5V/2.4A  USB2 output: fast charge 3.0 5V3A MAX  Support TF card capacity: 1G-32G  Working temperature: 0-60 degrees  Charging recognition: USB2 supports fast charge 3.0 protocol  Music format: MP3/WMA/WAV  Signal to noise ratio: ＞60dB  Distortion: andlt;0.1%  Frequency response: 20Hz-20Khz  Left and right channel separation: greater than 60dB  Bluetooth version: Version5.0+EDR  Bluetooth sound processing: A2DP (Advance Audio Distribution Profile) function  Bluetooth transmission distance: ＜ 10M  Bluetooth microphone effective distance: 0.5-2M  FM transmission frequency: 87.5MHz-108.0MHz  Transmit FM mode: stereo digital PLL lock frequency  Size: 13.5*10.3*6.2 cm/ 5.31*4.05*2.44”  Net weight:156g/ 5.5oz      Package attachment  1* Car MP3 Player  1*User manual  1*Audio cable  1*Package box