ELECTRONIC BACK-UP ALARM Piercing "beep-beep" tones warn others when you back up Rugged and loud 97 dB rating alarm sound Mounts easily almost anywhere For 12-volt to 24-volt vehicles. Fiberglass-reinforced housing is approximately 1-5/8"W x 2-5/8"H x 4"L. Universal mounting bracket included. 2-wire hook-up. Reliable solid-state electronics. Meets SAE J9445 Class C standards. Conforms to state, federal, OSHA and army requirements. Comes with manufacturer's 6-month warranty.