Like an all-metal construction. Bare wires to connect to anything as long as it's 110-120 volts. Very loud, sounds like a fire engine or police siren. As stated in the same decibels as the small door alarms I bought here. They're also supposedly rated at 110dB, but they don't come close to the hearing damage this thing can cause in any way. I plan to use it to scare any would-be burglars, peeps, stalkers, etc.
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