Brookstone Podz wireless rechargeable speakers with auto tuning

All your music without the wires: Simple to use just attach transmitter to your stereo system, TV, or mp3 player. Take your music anywhere to rooms where a stereo just won't fit outside or the deck. Listen to your Mp3 player without the headphones. Rechargeable: Two power option 1) Listen with speakers on rechargeable bases..or 2) Play wirelessly built in rechargeable batteries provide over 2 hours of music on a single charge. Great sound: No tuning ever. Phase lock loop circuitry. Automatically locks in and keeps audio signal clear and strong. 900 MHZ technology transmits through walls, floors, and ceilings up to 150 feet away from transmitter. Full range 3" driver provides clean, full sound.