Small, useful, with a few quirks - LOMO ELF-1 Night Vision Scope

The Elf is a neat little toy- small enough to carry anywhere, and it runs forever on common batteries. It does have one rather annoying feature- periodically the display will start to oscillate in a way that will startle you and alert any animals you're watching that there's someone close by- as well as wiping out your night vision. If you can put up with that quirk, it's a neat toy.
Pros: Tiny, effective, inexpensive
Cons: periodic blooming

This review was written in the old system and had content requirements that are different than reviews written today.