The HandEnergy weighs just 380g (14 oz). It has an Autostart mechanism.
This is how HandEnergy works,
1) Start HandEnergy by winding the starter ring
2) Release the starter ring. That will transmit an impulse to the rotor.
3) Rotate your HandEnergy with your wrist to keep the rotor spinning.
4) Average speed 5000 RPM. The magnetic rotor transmits mechanical power to the stator and produce an electric current, charging the built-in batteries.
It takes 40-60 minutes of spinning to charge the HandEnergy. The USB Output of the device is 5V 1A.
It can charge a number of devices like smartphones, flashlights, trackers, e-books, speakers, smartwatches, tablets and action cameras.
So next time your device is running low on battery, don't run around anxiously in search for a charging point. Just keep HandEnergy handy.