Cables Unlimted SPK24G Audio Unlimited 2.4GHz Wireless Indoor Outdoor Stereo Speaker with Remote and SRS WOW 3D Surround Technology 2.4GHz Frequency Hopping Spread Spectrum (FHSS) digital transmission 32-Channel scan-tuning between transmitter and receiver Audio output power up to 20 Watts RMS per channel SRS WOW provides deep, rich bass and creates a 3D surround effect to provide a superior audio experience Weather-resistant speaker and remote control