C2G/Cables to Go Audio Unlimited 2.4GHz Digital Wireless Indoor/Outdoor Stereo Speaker with Remote Dual Power Transmitter, Black (SPK-24GX) Product Dimensions: 14 x 14 x 8 inches; Weight: 9.4 lbs The 2.4GHz Wireless Outdoor/Indoor Speaker System comes with one speaker and is designed for either Mono or Stereo playback. For stereo playback, an additional speaker must be purchased separately. Mono playback is suggested when only one speaker is used in an area or room Transmission Mode : UHF Stereo Carrier. Frequency : 2.4GHz Digital Operation Voltage : Transmitter, DC 6C 300mA. Speaker: DC 12V 1.5A or 6 x D alkaline batteries (not included) Remote Control, 1 x CR2032 button cell. Frequency Response : 30 Hz 20 KHz Distortion : 0.5% S/N Ratio : 65 dB . Operation Distance : Up to approximately 50 meters/150+ feet (open area) . Speaker Audio Output Power : 20W Max. (RMS)