DORGARD Fire Door Retainer - White - Installs in under 5 minutes - Battery operated, wire free solution - Automatically releases when fire alarm sounds - Tested to BS EN 1155 and accepted by the Fire Brigade - Solves the problems of wedged-open fire doors - Dorgard is the acoustically activated fire-door hold open device designed to protect buildings and save lives whilst allowing freedom of access - Batteries included - Smart, unobtrusive & robust design - Easy, foot-operated release & adjustment - Automatic night-time release facility - Improves access for wheelchair users in line with DDA.