Backpack Time Traveling Device
The Backpack Time Traveling Device has recently gone through its third stage of development. It consists of tubing, wiring, and live mice.
The backpack is worn, and has a switch which hangs on the belt.
Once the switch is flipped electricity utilizes the life-forces of the mice to send the adventurer back in time. Two mice are needed per trip, and the backpack can only be used once (preferably to correct a misfortunate event). A keypad is mounted in the lower section, though the adventurer needs a certain character code to be able to activate the backpack.