Elaboration: 1. Introduction This car USB-MP3 transmitter is a controller, which uses USB groupware & MP3 of OTG. The user can save files in USB flash drive, plug that into USB connector and press "Play " button. Then OTG decodes the inner MP3 format from USB flash drive and transmit it to MP3 CMOS chip through a special stereo transitional CMOS chip, then transfer into FM high frequency signal. 2. Features *Supports the USB flash disk device (Version 1.1 or 2.0) *Search (MP3 File) for whole disk *3 buttons with 6 functions 3. Specification *Antenna: Built-in *Power: Car Lighter *Displays: Power LED, Play and Pause LED *Audio Out: FM *Transmitter frequencies(MHZ): 88.1, 88.3, 88.5, 88.7, 107.1, 107.3, 107.5, 107.7 4. Size: 84mm(L) x 35mm(W) x 22mm(Thickness) 5. Certificates * FCC. CE 6. Environmental Operating Ranges: *Operation Temperature Range: 0~ 60 Celsius Degree. 7. Power Consumption *Max Power Consumption: 1.2 W * Working voltage: DC10-28V 8. LED Indication *Red Light on: Power On. *Red and Blue Light on: Playing Music