ITEM NAME:RS1 FM Transmitter Bluetooth Car Kit MP3 Player LED Dual USB 3.1A Car Charg C9J1 RS1 FM Transmitter Bluetooth Car Kit MP3 Player LED Dual USB 3.1A Car Charg C9J1 Bluetooth Mp3 player with car charger and FM transmitter for cars only. The player can play the music files from memory card with its built-in MP3/WMA decoding chip and transmit the signal to car audio system through FM channel. If you make connection with a mobile phone with Bluetooth function, the device can switch to hands-free mode for an incoming call and resume music mode after the call. Besides, the device can wirelessly transmit the music from your mobile phone to car audio system. With a built-in echo cancellation microphone, you just need to press one key to switch between music playing and phone call. Nominal voltage: 12-24V. Limit voltage: 9V-28V. Output voltage: DC/5V/3.1A. Bluetooth version: Bluetooth V4.2+EDR. Frequency: 87.5-108.0MHz. Temperature: -20-50oC. Bluetooth distance: 10m. Microphone distance: 0-1m. Sensitivity: -85dBm. 1. Bluetooth hands-free talk. 2. Automatically detect the battery voltage of car. 3. Smartly identify various models of Android phones, Iphones and other devices; USB charging with maximum current output 3.1A. 4. External TF card/U-disk port. 5. Echo cancellation and noise suppression (CVC) technology . 6. Support music play by Bluetooth stereo A2DP. 7. HD large display. 8. Automatic connection to Bluetooth mobile phone after restart, power off memory. 9. Synchronous connection to 2 mobile phones. 10. Support the conversion between Chinese and English language. 1. Insert car charger into cigar lighter hole and main body screen will work and display current battery voltage of car. Main interface will pop out a second later. Starting frequency is 87.5 by default. Transmitting frequency of car should be consistent with product frequency. 2. For first use, the product is required to pair with mobile phone. Open the Bluetooth setting of mobile phone and choose