1. While using a grinder etc. While using it at the time of scribing, the place you are seeing and the place to hit the light are different, so you need to keep a close eye on it. 2. When removing the eyeglasses and wearing hands on the eyeglasses while holding the work gloves, the light comes on by touching the switch. How about changing the place of the switch or the hardness when turning on the switch a little more? 3. It is very difficult to remove the lid when inserting the battery. If item 2 is improved, I think that you will purchase repeat.