DAZONE Auto Universal 3.5mm FM Transmitter Wireless Radio Adapter With Build in Rechargeable Battery for iPhone 5S 5C 5 4S 4 3GS Samsung Galaxy S4 S3 S2 S1 Note 3 2 1 HTC, Sony, LG, Blackberry, Nokia MP3 MP4 Tablet PC Smartphone With 3.5mm Headphone Socket FM Transmitter for Mobile Phones, Tablet PC, MP3/ MP4 players, and other devices with a 3.5mm headphone socket. Hands-free talking function offesr you more safty during driving, clear and convenient to adjust the tuning frequency. 3.5mm LCD displays frequency with blue backlight. High Quality Stereo Sound. With Touch key design, High fidelity stereo. Digital PLL, transmisson is stable in different environments. Full frenquency range. Memory for last frequency. Powered by rechargeable built-in lithium battery,do not need to use the iPhone's power.