DIGITRENDS Bluetooth FM Transmitter with USB Flash Drives Car Kit for All Android & iOS Mobiles Crystal Digital Music Control and Hands-free Calling CARG7 Bluetooth Car Kit Fm Transmitter Wireless Bluetooth Fm Modulator Radio Car Mp3 Player with 1-port USB Charger Support TF Card/USB Mp3 Player Music Control Hands-Free Calling For All Mobile Phone. DESCRIPTION: This product is a special Bluetooth car charger with MP3 player, adopts professional high-performance Bluetooth module, built-in MP3/WMA decoder chip that can transmit music files of the USB disk to car stereo via wireless, and can switch an incoming call to the hands-free state as long as your mobile phone is provides with the Bluetooth function. When the call is finished, it will be switched to the music play automatically... FEATURES : FM transmitter. LED display window. LINE audio input. Independent Bluetooth start /shutdown button. Support MP3/WMA music format. Answer /hang up/reject/redial via Bluetooth. Bluetooth stereo music play. Call Echo Cancellation and Noise Reduction (CVC). Dual USB output voltage provides power to other devices up to 5V/2.5A. Automatic memory functions of power failure frequency point. Display of on-board battery voltage. TECHNICAL SPECIFICATION: Rated working voltage:12V-24V. USB output:5V/2.5A. Play format:Mp3 WPA. SNR:>60dB. Frequency response:20Hz-15 KHz. Bluetooth version:2.1+EDR. Bluetooth sound processing:A2DP (Advance Audio Distribution Profile)function support. Effective distance of Bluetooth microphone:0.5-2M. FM frequency: 87.5-108 MHz FM mode: Stereo digital PLL frequency locking COMPATIBLE WITH: 1 x Bluetooth FM Transmitter. 1 x 3.5mm audio cable. 1 x user manual.