Black, Acoustic Research Main Street Outdoor Wireless Speaker, 2 Way Speaker Design With High Performance Weather Resistant Drivers, Auto-Lock PLL Tuning Ensures Crystal Clear Reception Up To 150', Dual Power Mode, AC Adapters Included, Batteries Optional, 3 Selectable Broadcast Frequencies; Stereo Audio Input, Compatible With iPhone/iPod, Uses 6 "AA" Batteries, Not Included.