1. FM transmitter for iphone 2.FM75.5,FM79.5,FM87.5,FM87.9,FM100,FM107.5,FM107.9,other frequency can be customized. Features: 1.This FM transmiter supports transfer the audio to the car 2.speaker(frequency 88.1,88.7,89.3MHz). 3.Light and trendy design for portable convenience.4.Built-in 150mA Li-ion battery.5.Safety precaution. mimi wireless fm transmitter