The flashlight is an in-game item given to the player in Tattletail.
The flashlight is a large flashlight that, instead of using standard batteries, uses magnetic induction to build electricity. When the player first receives it, it glows green, but from then on it glows white.
The player receives the lashlight on December 21, 1998 after breaking the vase. The player must shake the flashlight by holding the right mouse button in order to power up the flashlight. However, this creates noise, and will attract Mama to the player. Looking at Mama directly will cause the flashlight to go out, forcing the player to flee until Mama teleports away.