A safe, convenient way of effectively managing fire doors. Conforming to legal standards, the fire door retainer is suitable for many different premises. It's ideal for nursing homes, schools and hotels that are required to keep their fire doors open. It can be installed in five minutes, is battery operated and requires no wiring. The intelligent device keeps the fire doors open when the environment is safe. However, if a fire alarm of 65dB or louder sounds for 14 seconds or more, it will automatically close the fire doors. Measuring 20.5cm x 19.5cm x 4.5cm deep, it is available in red or black.