Features 1. Bluetooth version 5.0: The transmitter adopts high Bluetooth version 5.0, which not only provides stable connection, but also reduces background noise through echo suppression, achieving better hands-free calling. 2. 7-color light switch: Short press "M" to change the color of the light at any time. By switching the order of red/orange/yellow/green/blue/purple/breathing lights, you can get visually stunning color displays. The best way to increase the ambient light inside the car. 3. Dual USB charging ports: The Bluetooth transmitter can automatically detect the type of charger, with USB1 5V/2.4A and USB2 qc 3.0 fast charging, achieving a maximum charging current of 5V/3A, saving charging time while protecting the charging phone. 4. Three music playback modes: Bluetooth in car can play high-quality music (MP3/WMA/WAV format), supporting Bluetooth input, TF card input, and AUX input modes; FM87.5-108MHz full frequency point transmission. 5. Support Siri voice assistant: Support solving mobile voice assistants to ensure safe driving. The one click voice assistant function allows for making phone calls, sending text messages, or obtaining routes. Enjoy complete voice control while driving. Technical parameters: Bluetooth version: Version 5.0 Bluetooth sound processing: equipped with A2DP (Advance Audio Distribution Profile) function Rated working voltage: 12V~24V Extreme working voltage: 9-26V USB port 1 output: 5V/2.1A USB port 2 output: 5V/1A Music format: MP3/WMA/WAV Supports USB/TF card capacity: 1-32G Working temperature: 0-50 degrees Sensitivity: -42dB+/-3DB Working current: 45MA (maximum) Standby current: 25MA (maximum) Frequency: 2.402-2.480GHz Sensitivity: -92dB RF output: 4DBM Battery voltage accuracy: error 1V Signal to noise ratio:>60dB Distortion:<0.1% Frequency response: 20Hz-20Khz Left and right channel separation:>60dB Bluetooth transmission distance: less than 10M Bluetooth microphone effective distance: 0.5-1M FM transmission frequency: 87.5MHz-108.0MHz Specification Material: ABS Color: Black Size: 14.3 x 10.8 x 6.8 cm Weight: 156 g Package Include: 1x Fast charging car Bluetooth player