Product Name: Dual USB Port 2.1A Vehicle Car MP3 Player Wireless FM Transmitter with Car Charging Function Support USB Aux-in Micro SD Model NO.: BT719 Format: MP3 Audio Output: Digital Audio Coaxial Voltage: 12/24V Certification: CE, RoHS Placement: Roof Combination: MP3 / MP4 Players Type: Car MP3 Trademark: OEM Transport Package: Color Box Specification: 100 Pieces/CTN Box, Size: 40 cm x 30 cm x 25 cm Origin: Shenzhen China HS Code: 4611120000 Product Description Dual USB Port 2.1A Vehicle Car MP3 Player Wireless FM Transmitter With Car Charging Function Support USB Aux-in Micro SDFeatures:1) Dual USB port charging, multi-car electronic devices at the same time meet the charge.2) Use TF card / U disk play songs stored, after power can play;(the machine which only USB2 support U disk player / charging port, USB1 only as a charging port)3) Support MP3, WA music file formats4) support for audio input, via the phone cord into the AUX Car MP3 audio holes FM transmitter Section, high-definition quality;5) The player with track automatic memory function, which allows you to remove the device after a power failure, scratch sounds of distress, when the player will remember the track being played back to power when the replay will automatically play the next time from this beginning.Precautions:1) This product is in operation or hot micro car will pause when you start / restart, is a normal phenomenon, ease of use.2) When using the product for long periods, unplug from the cigarette lighter.3) The machine only USB2 support U disk player / charging port (inside the USB port), USB1 only as a charging port (outermost USB port).Car MP3 use: 1. Plug the machine into the car cigarette lighter socket or charging, the machine will automatically enter the state of play and start playing the song;2. Set the frequency of play; short press M key, then press the up or down key song, the transmit frequency can be set to a desired value;3. Turn on the car radio, the radio frequency is set to the same with car MP3 player operating frequency. For example, car MP3 frequency is 87.5MHz, then tune into the radio frequency agreement (87.5MHz) can be played; if you encounter have murmur replace a frequency, time try to avoid using local radio frequencies to avoid interference, to achieve high clear sound.4. Playback volume control; direct fluctuation rotary switches to adjust the volume.Package included:1 x Car Mp3 Player1 x Remote Control Unit1 x Audio Cable