Wolverine WIOS4 Wireless Indoor-Outdoor Stereo Speakers - Water Resistant - Black (Four Speakers) 2.4Ghz Wireless Sterio Pair System with Premium Sound Quality! Water resistant for outdoor and indoor use Portable battery and AC powered - ready to take anywhere More than 200 feet transmission range with on transmitter, connects to all Smart Phones and Music players Left and right channel stereo separation, built-in soft blue lights for extra ambiance at night, no-wires thus simple setup in minutes