This is "The Lavine Boys' Christmas Caroling Adventures" Keychain Flashlight!  The boys used flashlights  many years when caroling - not only to see in our van when the lights were on the blink - but to see to and from their caroling stops in the dark.  These are the perfect size (2 1/2" long) to shine a little light, to be held in hand or slipped in a pocket.  The boys used the ring on theirs to slip through their fingers for easier handling.   These would also be the perfect add on to the books as an extra gift that would 'shine a little light' into someone's world.