The ELK-150RT is a self-contained siren in a tamper and 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._x000D__x000D_The ComboTrigger option allows controls which have a single alarm output and pulsing option to activate both the burglar and fire alarm sounds._x000D__x000D_ Installer Friendly – Easy to Mount – Exterior / Interior use_x000D_ Sealed Reed Tamper Switches at single bolt closure and at rear of cabinet_x000D_ Corrosion resistant stainless steel construction_x000D_ Compact – Less Noticeable_x000D_ Loud – Rivals Sound of Larger Speakers_x000D_ Heavy Duty 1.8 lb Magnet_x000D_ ComboTrigger For Single Outputs_x000D_ Pre-Wired For Easy Installation_x000D_