The ELF (Excellent Little Flashlight) is so small it can comfortably be carried on a keychain yet it's so bright it embarrasses flashlights ten times its size.  It includes a rechargeable lithium ion battery, charger, reversible/removable pocket clip, and a small carabiner clip to attach it to your keys.  The three output settings give the option of high output or longer run times.  It is hard not to fall in love with the ELF.