... with FM Transmitte for iphone4 new and best battery for iphone,OEM service Super thin and light, It is a FM Transmitter, ... capacities at 20%,40%,60%,80%,100%5.With 4 FM transmit frequencies: 88.1/88.5/88.9/89. ... 3MHz6.With FM transmit frequency memory function.7.With auto power off function ... 14.5mm Weight:68g Charging cable included backup battery with FM Transmitte for iphone4