Batteries ready fitted (Energizer, not some cheap rubbish). Works well with good sensitivity, detecting live sockets/switches etc without having to insert it right inside. The light is bright enough to see clearly in daylight, but not blinding in a dim loft/cupboard. The clip is secure and grips well, so you're not wondering if its going to drop off down a wall cavity or something (not that I've ever done that...). Recommended.
Essential tool for anyone going near electrics - I'm a plumber and always use it to test that copper pipes aren't live before touching then - (I have found a few that are over the years). So a life saver. Also very useful for diagnostics.