Offered exclusively by Hammacher Schlemmer, these are the rechargeable, water-resistant speakers that produce robust sound by a swimming pool or indoors without requiring speaker cables or an AC outlet. The included transmitter connects to an iPod or other MP3 player, stereo system, television, or portable CD player and broadcasts a digital wireless signal to the speakers from up to 30' away. Digital wireless signals are less susceptible to interference than analog signals, resulting in crystal-clear transmissions that penetrate walls, floors, and ceilings. The 15-watt speakers' integrated 5" subwoofers reproduce deep bass frequencies and 1" tweeters disperse accurate high frequencies, providing optimal tonal balance and crisp sound. The rubber bases provide ideal stability on any surface and built-in handles ensure ease of portability. Each speaker's rechargeable battery operates for eight hours on a seven-hour charge. Includes AC adapters for recharging the speakers, two brackets for wall-mounting, an RCA cable, and a remote control. Transmitter plugs into AC. Each speaker: 10 1/4" H x 6 1/2" W x 6 2/3" L. (7 1/2 lbs.) Transmitter: 1" H x 4 1/3" W x 4 1/3" L. (5 oz.)