Here's a handy little "flashlight" with a quick-release key-ring system. It is only 7/8" wide x 1-3/4" long x 5/16" thick, so it can easily fit in your pocket or purse and be there when you need it. It has a bright solid-state LED (light emitting diode) long-life bulb that will last for over 100,000 hours. It includes two easily replaceable lithium batteries (CR2016) with a shelf life of five years, that will power the flashlight continuously for about five hours.
It is available in a choice of four light colors: red, white, green, and blue (note: the case is black in color on all units). It is ideal where weight and size are a factor (backpacking, emergency kits, etc) and it makes a great gift!