Substantial bright plastic-chrome horn with black diaphragm housing and metal encased motor.This klaxon recreates the genuine old OOO-GAAHH sound rising and falling as the motor speeds up and slows down. It is 230mm x 120mm overall, and the chromed-plastic horn section is 120mm long. 12volt with two Lucar push on terminals and a short wiring loom to ease connecting. Makes an excellent boat or yacht horn. Requires a single 6.5mm hole to fix and the bolt is included.