Von Duprin 99 ALK-36-US28, 99 Series Alarm Kit With RX Switch,36"

• Add to any 99 rim device to an alarm on egress of door
• Simple yet effective way to deter unauthorized use of an opening
• The horn is rated at 85 decibels
• Armed or disarmed by key
• Operates on one standard 9-volt alkaline battery
• When battery is weak, the horn will emit an intermittent low battery signal
• The ALK can also be hard wired and powered using a PS9 power supply
• Comes with standard RX switch
• Uses a standard 1-1⁄4" mortise cylinder w/ straight cam (not included)
• Mortise Cylinder NUT is INCLUDED