Viking Horns V715 Loud Electronic Musical Horn With PA System And 15 Programmed Sounds for Car/Truck/Boat With 15 Pre-programmed sounds Loud at 105 decibels PA microphone included Required Power: 12 volt system, 1.5-amps Controller Size: L 6 in. x W 4-1/4 in. x H 1-1/2 in.