I have mixed feelings about this device. It works GREAT. This is Greenlee. It should be so. BUT not having an ON/OFF switch was a bad decision. Touching any of the 4 buttons will turn it on automatically. The second time I used it I had to change the battery. A poor choice for Greenlee to remove an important figure. If they had provided a dedicated case it might not have been a problem, but they didn't. I kept the device and always try to pack it in my bag so that the buttons don't touch. Everything impossible.