Distinctive warble and whoop siren. "Center Off" control switch mounts on dash. Compact amplifier conveniently fits in remote locations. This solid-state 12-volt siren powers one 100-watt RMS speaker. Speaker sold separately. Dimensions: Amplifier 2 3/8"H x 3 1/4"W x 5 3/8"L Switch 1 3/4"H x 1 1/4"W x 2 5/16"L