Acoustic Research AW822 900 Mhz Outdoor Wireless Speaker (Single, Brown) (Discontinued by Manufacturer) Wireless speaker can be used indoors or out and has up to 250 foot range Water resistant design with built in carrying handle and tripod feet for ease of use and stability Automatic level control avoids sudden changes in volume while 2 way acoustic design provides high quality omni directional sound Convenient push button auto lock phase lock loop tuning locks onto transmitter signal and guarantees clear audio Dual power mode with AC adapters supplied -batteries optional