Intelligent frequency division technology, dual-port fast charging, dual-USB interface design, to meet the requirements of the main driver and co-driver's two devices at the same time, the dual port output up to 2.1A at the same time, fast charging saves time. The large 1.3-inch LED screen has rich display content, displays the voltage when it is turned on, and can display the name of the frequency point file and the working status. Using 4.0+EDR Bluetooth-compatible chip, high-speed transmission speed, can transmit high-bit-rate music signals, and can quickly establish a connection. Not only can it be played by frequency, which allows you to enjoy good music simply and quickly, but also supports your familiar way of listening to music. With the help of a 3.5MM audio cable, connect to the car stereo through AUX external playback mode, you can play music at any time Up. Support TF card/U disk music playback, cut songs, adjust the volume, answer, hang up, just one touch, convenient and free, one key to get the car life, to help you drive safely. Automatically reconnect after power-on, memorize the frequency, and after the track is restarted after power off, it will start to play from the disconnected song. Wireless tethering and plug-and-play, eliminating the trouble of fixing, 180 rotation, saving space and convenient to use. 1x Host 1x Manual 1x 3.5mm Audio Cable Material:ABS Size:Approx.10x13cm/3.93x5.11inches Color:Black Limit working voltage: 8-27V USB output: dual USB output 5V/3.1A Working temperature: 0-50 degrees Charging recognition: USB2 supports 5V/2.1A Voltage detection accuracy: +_1V Signal to noise ratio: >60dB Distortion: 60dB Bluetooth-compatible version; Version4.0+EDR Bluetooth-compatible sound processing; A2DP (Advance Audio Distribution Profile) function Bluetooth-compatible transmission distance: less than 10M Bluetooth-compatible microphone effective distance: 0.5-2M FM transmitting frequency: 87.5-108.0MHZ Transmit FM mode: stereo digital PLL frequency lock Support FM full frequency point transmission function 87.5-108.0MHZ Support dot matrix screen display 1.3 inches Support U disk playback function Support TF card playback function Bluetooth-compatible answering, hanging up, rejecting, redialing and other functions Support Bluetooth-compatible stereo music playback Echo cancellation and noise suppression (CVC) technology during a call Support dual USB output voltage, supply power to other devices, output a total of 5V/3.1A Automatic power-off memory function Support charging recognition Support MP3/WMA format music playback Support multi-language selection Support display contrast adjustment Support electric frequency voltage detection 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.