A simple device for a very simple process.
It takes one AA battery, the head comes off for cleaning, it trims the nose hair very satisfactorily without pulling or pain.
The construction is not very sturdy, but it doesn't get damaged at all, you just touch it to your nostril and trim. If it falls, it will probably break easily, but that's not a serious reason for negative criticism, it's a trimmer, not a hammer that falls and doesn't break anything.
For its price, it's great!