Car FM Transmitter Bluetooth Gold Automatically detect the charging device and the charging environment correspond to the optimal power supply, display the output value, smarter than others.Can automatically upload MP3 files from USB driver, play micro SD card directly and upload support, Dual USB output voltage, power supply for other devices, max power 5V/2.5A. Excellent Hi-Fi stereo sound quality. High-performance built-in microphone with echo cancellation and noise suppression (CVC) for clear entertainment and great music.Bluetooth version: 2.1 + EDR. Just pair your phone with Bluetooth FM transmitter and its hands-free phone can ring while answering in time.Properties:1. FM transmitter 2. LED display window 3. Audio line input 4. Independent Bluetooth start/stop button 5. Supports playing music from USB HDD 6. Support MP3/WMA music format 7. Answer / hang / reject / redial Bluetooth 8. Bluetooth stereo music playback 9. Echo calls and noise suppression (CVC) 10. Dual USB output voltage supplies power to other devices up to 5V/2.5A 11. Automatic frequency point dimming memory function.12. Displays vehicle battery voltage Parameters:Material: Engineering plastics Rated working voltage 12V-24V Limit working voltage: 9-262V USB Output: 5V/2.5A Operating Temperature: 0-50C (32h-122h) Playback format: MP3 WPA SNR: 60dB Distortion Rate: Frequency response: 20Hz-15kHz Bluetooth Version: 2.1 + EDR Bluetooth audio processing: Support A2DP (Advanced Audio Distribution Profile) Bluetooth transmission distance: 10 m Bluetooth microphone effective range: 0-2m FM frequency: 87.5-108MHz FM Mode: Digital PLL Frequency Lock Packing List:1 x car charger.1 x USB charging cable.