Description: Hands-free talking function offer you more safty during driving, clear and convenient to adjust the tuning frequency. 3.5mm LCD displays frequency with blue backlight High quality stereo sound,With Touch key design, High fidelity stereo. Powered by rechargeable built-in lithium battery, do not need to use the iPhone's power. Universal Compatible With:All devices with 3.5mm headphones socket ,iPhone (all incluld iPhone 4 4S 5 5S 6 6Plus),iPod (all),Samsung Galaxy S, S2, S3, S4  Specification: Transmitting Frequency: 87.5-108.0 (MHz) Effective Range: 5~10M Voltage：5V Output of the USB Car Charger: 5V/ 1000mA Distortion degree: 2% Current: 30ma (FM transmitter) Frequency response: 20-20kHz Left and right channel isolation: 45 (dB) Color: Black Size:Approx.6X2cm How to use: Turn on the transmitter by switching it to “ON”. Connect the transmitter with mobile phone or device with 3.5mm aux-out earphone jack. Press “+” or “-” on the transmitter to select frequency. Tune your radio frequency to the same frequency of the transmitter. Connect the transmitter with the car charger and insert the car charger on the cigar lighter socket to charge the transmitter. Music will be transmitted to the car radio stereo system and play while charging. Package Includes: 1 x 3.5mm FM transmitter 1 x USB cable Note: Please use the legal local frequency when choosing FM transmission frequency