Elk Products 150RT is a 30W siren with tamper switch. It is a self-contained Siren in a tamper, corrosion resistant stainless steel enclosure. It features two sealed reed tamper switches, one on the back plate and one on the front cover. The switches are normally closed and pre-wired in series. The ELK-150RT can produce two distinct sounds from a single input trigger. The stainless steel exterior reflects the color of the mounting surface allowing the ELK-150RT to blend easily with any residential or commercial building. The ComboTrigger™ option allows controls which have a single alarm output and pulsing option to activate both the burglar and fire alarm sounds.