My MB walk-in closet only had a cheap light bulb socket in the ceiling with an awkward string pull switch. I'd have to fumble for the string in the dark to turn on the light, which was annoying. With the new Alexa devices, I bought a smart bulb socket and connected it with Alexa. It worked fine and was easier than the string pull, but I'd have to tell Alexa to turn on the light in order to light the closet and then turn it off. Then I found this product. It screws into the light fixture the same as the bulb would or the smart socket, but requires no wifi connection because it's motion sensitive. It works great! I just open the door and the light turns on automatically as I enter the closet. The unit is adjustable to stay on from 10 to 60 seconds, according to your needs. Mine is set at 30 seconds, which is usually more than enough time for me to get what I want out of the closet. If I need more time, I just wave my arm in front of it after it goes off and it turns on again for another 30 seconds, but this is very infrequent for me. I think I've had it for about two years and it still works perfectly, so it seems to be very reliable and durable. It can use up to a 60 watt bulb, so it's plenty bright enough for my closet. I'm very happy with this product, and it saved me a lot of money over hiring an electrician to put in a light switch. I'd heartily recommend this product.