GAI-Tronics 30 Watt Poly-Carbonate Speaker This is very unique and good quality product introduced by Gai-Tronics which is very helpful while communicating in industrial area at the time of emergencies, for example in case of fire explosion and blast, and it is highly efficient in creating various voice frequencies, its weather proof and not as much expensive as the Poly-Carbonate speakers are in the markets. Features: 8 Ohm, 30 Watt Impedence Version or 50/70/100 Present Variety XFMR Version with Six Present Taps Non-Corrosive and weatherproof Poly-Carbonate Speaker w/Stainless Bracket 115/30 Stage Submission Location @ 1000/4000 Hz. Dimensions: 9 3/8" D. x 11.25" L