Acoustic Research AW880 Wireless Speaker It provides omni-directional 900MHz broadcast. It has effective transmitting range up to 150 feet. It has frequency response of 40Hz-15kHz, left/mono/right switch. It has 1.5" tweeter, 3"woofer, 10 watt total RMS. It has 2 wireless speakers, transmitter, 3 AC power adapters included. 1.5" tweeter, 3"woofer, 10 watt total RMS Frequency response: 40Hz-15kHz, left/mono/right switch 2 wireless speakers, transmitter, 3 AC power adapters included Effective transmitting range up to 150 feet Omni-directional 900MHz broadcast