Specifications: 1. Plug the unit into cigarette lighter of your car directly. 2. Plug USB flash dick into car mp3 transmitter through U disk jack, 3. Press the CH button to Select one from 7 FM that not interfere with local broadcasting station. 4. Tune the frequency of your car's stereo to the same as the unit... 5. Press the play button on the FM modulator to enjoy your music. Color: Silver, pearl white Size: 10.6 * 4.2 * 2.9cm Package: Plastic box (clamshell with insert card), Gift box (White/Color box) N. W. Per unit: 45. 5g G. W. Per unit: 100g (plastic box ), 193g (gift box ) Measurement per Carton: 50cm * 38cm * 48cm Weight per Carton: 6.117 kg (plastic box ), 10. 767 KG (gift box ) PCS / CTN: 50 Voltage: 12V DC Power Operating Current: < 100mA FM Frequency: 7 FM Channel (87.7, 87.9, 88.1, 88.3, 88.5, 88.7, 88.9MHz) Channel Switch: Press the 'CH' key to switch preset channel Audio Source: USB Flash Disk or MP3 Player