Here are some drawbacks of the product:
This wand works only when held light down, in a horizontal position. An internal control switches it off when held vertically (on walls) or light up (on ceiling and underside of furniture).
The 'on' control-light is much too bright and the 'on - off' beeper much too loud, which also contribute to short battery life.
The wand is inconveniently and unnecessarily large/bulky, in relation to the comparatively short UV bulb which is only about 1/3 of the overall length.