The Tortech voice projector # vp-15 is an over the shoulder portable p. A. It provides 15 watt of amplification with excellent voice reproduction. The Vp-15 operates on 8 “c” size batteries or it can be used with the tt125 ac Adapter. It has a detachable microphone or it can be use with the hs-11 Headset. The vp-15 is popular for police and fire department, schools events Guides, sporting events and crowd control.