I ordered this detector for my elderly mother who lives alone and uses a gas cooker. She started to turn on a gas tap whilst leaving the gas unlit, and we discussed with her how best to deal with this dangerous situation. She finally agreed that i could research some gas detectors for her. I was somewhat concerned that she may come to rely on the detector to let her know if she had turned on the gas tap without lighting it, rather than checking the cooker herself. However, this has proved to be an amazing gadget which plugs into the mains and is ever so sensitive. She telephoned me a month or so after installation rather panicked saying that the alarm was making a very loud noise and she couldn't understand why. I asked that she open her door and also check her gas taps. Sure enough she had left a gas tap slightly on without it being lit. The alarm stopped sounding and she was pleased we had managed to prevent her causing severe damage to herself and her neighbours. The gadget comes with installation details, and my mother does feel safer - as do my family and i.