Audiovox Acoustic Research AW825 Mission Style Wireless Speaker (Bronze)-Refurbished Three selectable broadcast frequencies; stereo audio input; compatible with iPhone/iPod Two-way speaker design with high-performance weather-resistant drivers 2-inch tweeter, 3-inch woofer, 5-watt RMS; frequency response: 40 Hz to 15 kHz Auto-lock PLL tuning ensures crystal-clear reception up to 150 feet Dual power mode; AC adapters included, batteries optional (six AA batteries not included)