Needed to replace a broken switch on an asthma nebulizer. You could get a switch for about 75% the price of a 5-pack, so you got a 5-pack; The switch was easily replaced (the machine now works great) and has 4 backup switches in case it breaks - or any other device that uses a similar switch. In other words, it delivers what it promises! Just make sure you know which switch you need for YOUR project.