1.A wireless 5.0 chip and high-performance audio decoding module offer HD lossless quality. 2.An internal chip with optimized circuit technology and a MCU+DSP dual-core processor effectively eliminate background noise and prevent frequency interference. 3.A digital display shows the voltage once power up. 4.Wireless indicator light flashes and a voice reminder sounds when the wireless pairing is successful. 5. FM frequency：87.5-108.0MHz/Input: 12-24V 6.USB total output: 5V/3.4A(Max) :USB1：5V/1A USB2 5V/2.4A Output Interface:2 C Ports Quality Certification:CCC Power Source:Car Lighter Slot Model Number: Type: Max. Output Power:Other GaN:No Applied Fast Charge Protocols:USB PD Origin:CN(Origin) Certification:CCC PCS X 1