Window stays allow a window to be fastened in the open position. Some stay locks prevent the stay being lifted off the catch and the window being fully opened for access. However, they do not prevent the stay from being cut through. Their main advantage is in preventing young children from climbing out of the window.
TIP: KEEP KEYS HANDY
Security devices are for keeping burglars out and not you in. In the event of a fire you should be able to unlock them easily and quickly. So keep keys near the window, but out of reach of a burglar’s arm stretching through a broken pane.