The G.R.I. Hold-Up Devices can be installed in fast food restaurants, banks, mini-marts, health care facilities, jewelry stores or any installation that calls for an absolutely silent emergency alarm. Their unique design features a glowing green LED to indicate an armed state. To insure against accidental tripping, both finger pads must be touched simultaneously. When this occurs, the LED glows red and the zone will go into an alarm condition. An accidental bump or touch will not trigger the G.R.I. Hold-Up Devices. A magnetic key is supplied for resetting the HD-1 latching model. C2T technology allows even an operator wearing gloves to activate sensor. Perfect Hold-Up Device for fast food restaurants.