Hand-cranked generators are nothing new, but the Lifesaber makes it easy by allowing you to operate it one-handed. Twirling the device for 15 minutes generates enough charge to power up a dead mobile phone. You can also crank it with two-hands to generate more power in less time. It has a 2200mAh battery, a charging port, a flashlight and a siren. It also has optional water filter and plasma lighter modules.