Does everything it is designed to for a lot less than many other brands!
First thing I noticed -- no switch. It sits on my desk and randomly beeps for 3-4 seconds. It sensed where I knew there was AC. But I wouldn't trust using it if it was critical that I know when it was safe to work on a circuit. Thus it is useless.
After 6 months of occasional use this thing is DOA. New batteries and it doesn't even beep when put on a hot wire, don't trust it!
I just got this. It comes with a warranty. It is in working order. Takes 2 triple a batteries.(not included)
A good. Voltage detector is a quick and easy way to stay safer while working with wiring. I went for this one to get one that uses normal batteries.