The Easy fit Lindam Alarm Baby Stair Gate has a unique built in alarm that sounds as soon as the gate is opened. After a few seconds the soft primary alarm increases to a secondary alarm if the stair gate is left open. This acts as a reassuring alert to the parent in case older children or visitors have forgotten to close the safety gate behind them. Lindam Alarm baby stair gate includes a secondary locking mechanism. The U shaped power frame gives solid pressure fit without the need for drilling or screws. It also has dual action opening system and adjusts to fit opening between 75cm and 81cm. The alarm of the stair gate is operated by 2 x AA batteries which are not supplied.