A "shake-style" mechanically powered flashlight, the Morrow Project generator flashlight contains an ultracapacitor that is charged by shaking the flashlight, which moves a linear electrical generator. Unlike dynamo-powered mechanically powered flashlights, the shake-style does not need to be charged continuously, but once every few minutes.
d20 Modern Rules: The Morrow Project generator flashlight functions as a standard flashlight, but does not require batteries. Instead, the flashlight must be charged by shaking it as a full-round action. After charging, it functions for five minutes before needing to be charged again.