These tiny flashlights are very functional. You push the button on the bottom and it gives you a bright beam of light, press the button again and the light is a little dimmer, and the third time you press the button it turns on a strobe light. The description mentions 4 modes, but mine only has three.
I have one in my desk, and the other is on my shelf next to my bed. You never know when you will need a light, so they are handy. They come with a strap attached and they are a little less than 4 inches long.
I really don't know about the battery life, as I've just gotten them, and I haven't used the charging cord yet.
I am happy with my purchase, and hope these little flashlights will last.