I purchased this item instead of others because it's a Fluke and I know I can trust it to work and work properly. Using it is easy and the flashing light to indicate proper function is a welcomed feature. The audible beeper can be turned off, but I don't do that. It's nice that it comes with batteries, and that they are AAA which are easy to come by anywhere. However, opening the device to change them is a little difficult. The reason I gave it four stars and not five is that it takes a bit long to sense live wires. Sticking it in an outlet is faster, but putting it against a wire takes a bit longer. It definitely isn't a near instant response. Also, as others mentioned the item I received was not in any sort of packaging. Not a box or clamshell. It was just a plastic bag with the device and instructions in it and an Amazon sticker describing the product. A little strange. I saw no indication of where it is made.