For iPhone 4G FM Transmitter(Wirelessly) Features * High fidelity, stereo. * Digital PLL, transmission is stable in different environment. * Full frequency range. * Memory for last frequency. * Powered by iPhone/iPod. * Mutes the music during calls. * Range of up to 10 meters. * Blue backlight. * With charging socket for iPhone / iPod at the bottom. Specifications * Transmission range: 88.1MHz 107.9MHz (interval 0.1MHz) * Remote control includedCompatible with * FitsiPhone 4G,iPhone / iPhone 3G / iPhone 3G S * Compatible with iPod classic, touch, nano 4th, nano 3G, video, nano 2G etc. * Color: you are bidding on the silver color Use Means * Connect the FM transmitter to iPhone / iPod. * Tune into an unused (blank) frequency channel of the receiver and adjust the volume of the receiver. * Press "+" or "-" button to adjust the frequency of the FM Transmitter according to the receiver. * The FM transmitter will automatically save the last frequency when you disconnect it. * The Fm Transmitter will mute the music during calls and resume playing music after calls. * When connecting the FM transmitter to iPhone / iPod, you can charge iPhone / iPod with a travel charger or car charger connected to the socket of the FM transmitter.