I ordered two of these "Voltage Detector". It both are not working. the voltage tester've ordered just for the reason that I have two small screwdrivers. For voltage check I've never actually in use. That's why I have not returned. The 2 stars are there because they act as a robust screwdriver and well in the hand.
Before anyone thinks I'm too stupid for proper use, I have to disappoint you, I'm a trained electrician. :)