Our 11" x 8" weatherproof PA speaker has a 70/ 25V line transformer with settings of 30W, 15W, 10W, 5W, 3W and 1W. It offers a frequency response of 250 to 16, 000 Hz and a 30 watt power rating. It features a sensitivity of 120 dB with an impedance of 8 ohm. A swivel mounting bracket is included. Also known as -SPC30RT Megaphone-Speco Technologies SPC-30RT 30-Watt Weatherproof PA Speaker With 70/25V Transfor-SPECO SPC-30RT 30WATT PA HORN W/TRANSFORMER-Speco SPC30RT Megaphone