Iphone4 Handsfree FM transmitter Compatbleaaiphone 4/3GS/3G/IPOD/IPAD also availbe for ... Other colour can be customized)Frequency FM75.5,FM79.5,FM87.5,FM87.9,FM100,FM107.5,FM107.9,other frequency can be ... available all marketing. 3. Auto memory the last frequency. 5. Auto stop the music once the call in,auto play ... capacity:200mA.10.Working time:10 hours(Charge 1 hour) FM Transmitter for iphone ipod