Moonar&reg; Wireless In-car Handsfree Fm Radio Transmitter Audio for Iphone Ipod Mp3/4 Play Touch key design, LED display, more convenient to choose. High fidelity, digital PLL makes the transmisson stable in different environments. Full frequency range, up to 200 for choice. Memory for last frequency. Powered by rechargeable built-in lithium battery, do not need to use other equipments' power.