Simply plug the transmitter into the earphone jack of your i-Pod and play your tunes through the floating PoolTunes speaker! Waterproof to 3 feet under water for up to 30 minutes. 3 Watt full Range Speaker Wireless broadcast of up to 100 ft. Compatible with most MP3 players LED pool light for night time operation. Rocker style volume control Requires 4 "C" batteries, transmitter requires 4 "AAA" batteries.