The Marinco Compact Mini Twin Electric Horn has two totally sealed sound units with type 304 stainless steel covers, diaphragms, and mounting bracket. 12V twin horn. Maximum amp draw: 6 amps. dB(A) rating: 109 at one meter. Fundamental frequency: 490±20 / 440±20 Hz. 3"L x 8"W x 1.75"H.