This Horn Button is a panel mounted, push button, momentary On-Off switch for operating fog horns, sirens etc. Mounts in 1/2″ diameter hole and is wired with 1/4″ QD terminals. This horn switch comes with either a standard black button or bright red button to make it easily identifiable in emergency situations. Maximum panel thickness: 5/16″”. Constructed of nylon/phenolic and chrome plated brass. 15A @ 12VDC.