Stebel 11452139 - Magnum Electric Horn Combo Black 2 Electromagnetic style horns in a black ABS finish Harmonized twin tone sound (410Hz and 500Hz) at 139dB Compact size for easy installation - 2 horns at (4" x 3" x 2 1/2" tall) 3 amps each at 12volts - Fits under most stock motorcycle covers. Inculdes a relay Will work with any 12 volt system (car, truck, motorcycle, golf cart, RV, bus, Rhino, Gator, ATV, boat, Hi-Lo, )