Compact design 70V/100V wall mount PA speaker BS-120 is adopt coaxial 4-inch speaker, deliver 20W power of perfect sound, high quality of music or voice speech reproduction. The swivel bracket allows speaker rotatable and adjust direction of sound projection. Public address speaker system BS-120 is compatible to commercial audio in 100v line, and also available in 8 ohm or 16 ohm low impedance for home audio theater speaker system.