2.4GHZ BLACK WIRELESS SPK 2 PK2 PACK W/REMOTES&S2.4GHz Frequency Hopping Spread Spectrum (FHSS) digital transmissionDual power transmitter utilizes either AC power or batteries (4 AA batteries - not included)32-channel scan-tuning between transmitter and receiver5" 2-way 20-watt weather resistant speaker powered by 6-D batteries (not included) or by AC adapterMood light effectSpeaker and remote are water and UV resistantSupports stereo audio up to 6 speakers (additional speakers purchased separately)Operating distance up to approximately 150' in open areas (less through walls and other obstructions)Auto volume level controlIncludes 2 speakers, RF transmitter, remote control, AC adapter for transmitter, AC adapter for speaker and RCA to RCA cable