3.5MM AUDIO INPUT JACK ON TRANSMITTER; AUTO ON/OFF TRANSMITTER ; 900 MHZ ANALOG ; UP TO 300-FT OUTSIDE RANGE ; UP TO 7 HOURS BATTERY LIFE DEPENDING ON VOLUME ; VOLUME, BASS-BOOST, TUNE & POWER CONTROLS ON EACH SPEAKER; SPEAKERS COMPLY TO INTERNATIONAL WEATHER PROOFING STANDARDS ; EACH SPEAKER REQUIRES 8 X AA BATTERIES OR INCLUDED UL AC WALL PLUG; INCLUDES 2 WEATHERPROOF WIRELESS STEREO SPEAKERS, 1 WIRELESS TRANSMITTER FOR IPODŽ/MP3/STEREO/TV & 1 WIRELESS REMOTE ;