Giveumore LH-101 Universal 90 Degree Foldable 3.5mm Headphone Jack Mini Car Stereo FM Transmitter for iPod iPhone Smart Phone Tune your car stereo or receiver to the FM frequency, and enjoy your digital music with full sound and convenience The 3.5mm headphone jack can be 90 degree fold into thehidinghole, more convenient to carry With LED display to show the frequency range With key buttons design, easy to adjust the frequency range Power by rechargeable built-in lithium battery, no need your phone power