Usage: 1. Frequency Modulation: Turn on car radio and select no broadcast frequency 2. Frequency Match: Insert this FM transmitter into car cigarette lighter socket and set the same frequency 3. Insert memory or USB flash drive to FM transmitter, or connect your phone with FM transmitter via . 4. Then the FM transmitter will automatically play the music in your memory card, USB flash drive or mobile phone. Description This is a FM transmitter, car Stereo, MP3 music player. The simple hands-free solution to bring wireless audio to your existing car stereo and listen to your favorite songs. You can connect it with your Phone or iPod, play your favourite music to relax your body and mind during your driving. You can also insert TF into the slot, then automatically play and transmit the MP3 and WMA music. Feature - Color: As shown - Material: ABS - Size: 5.6 x 5.5 x 7cm - Display: 1.3inch - Working voltage: 12V/24V - Frequency Range: 87.5 - 108.0MHz - Bluetoot version: 4.1 - Wireless Range: 0.5-2M - Digital Media File Compatibility: MP3 WMA - Built-in FM Radio Transmitter - Universal Car and Vehicle Compatibility - Wireless Streaming Receiver - MP3 Digital Media File Support - USB Port for Device Charging - Hassle-free design and simple plug-in Operation - Transmit Your Phone Calls Through Your Vehicle's Speakers - Micro SD USB Flash Drive Readers - Digital LCD Display with Simple Button Controls - Usage: After the FM transmitter was set into mode, open the of your phone and search "car kit", then clike "match". After your phone is successfully connected to theFM transmitter, you may enjoy wireless music and hands-free call. Note: This product is for audio input, not for audio output. The audio cable can not be connected directly to the AUX interface of the car.