CyberTech Handsfree Kit 8pin to 30pin FM Transmitter And Audio Dock Speaker Adapter Connector for iPhone 5/ 5C / 5S Touch Portable, compact, lightweight and easy to carry Switch to select from Radio FM frequency 88.1, 88.3, 88.5, 88.7 MHz Connect to most 30 Pin dock speaker (may not be compatible with some dock station) No power needed when connect with iPhone 5, can also charge iPhone 5 when connect to power with 30 Pin connector. (When battery power is low, it may cause the phone to lose signal after plug in. Wait for a few minute for the signal level to come back, Otherwise, charge your phone or plug in power to the adapter.) Sold exclusively by Cybertech with 1 year warranty