"A good product. Works well, except when noisey trolleys etc, pass by and release the door, as it is triggered by sound. Plays an electronic sound when the battey is going flat. Some people can't work out where the sound is comming from and don't realise it is the Dorgard."
"This is a very clever way of providing the means to hold open a Fire Door in a safe way, without spending hundreds of pounds having a magnetic device hard wired to your fire alarm system, but the door can still close in seconds when the Fire Alarm sounds. They cost less than £100, take minutes to fit rather than hours or days with a hard wired system and don't involve damaging the decoration and can be fitted by anyone with a bit of savvy. This is one of those magic solutions which crop up occasionaly in the way WD40 did years ago."