Outdoor battery back-up siren with flashlight Double housing: external 3mm plastic ABS with UV,internal 0.8mm metal Continuous frequency modulated sound Tamper protection in 3 ways-screw or cover opening or tearing housing from the wall Positive and negative alarm trigger input Trigger input to active only the flashlight Siren period can set as follow trigger or 3 min cutoff Alarm by main power failure Protecting against totally battery discharge Plug terminal for easy installation Environment immunity
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