iLive iSA30B Wireless 3.5mm Aux Speaker Pair of wireless speakers with a digital 2.4 GHz ISM wireless transmitter For indoor or outdoor use - weather resistant Transmission distance up to 200 foot line-of-sight and up to 90 feet indoors 3.5mm stereo line-in jacks Powered by AC adaptor (included) or 6 D batteries (sold separately) 2.4 Ghz Wireless Speakers Multichannel Wireless System Indoor/Outdoor Speakers