DynaStrobe Battery Free Safety Light
It can avoid the hassle when you want to go exercise after dark, but the batteries are dead, and you have no replacement.
The kinetic energy generates from your motion will be converted into electricity. This is sufficient to power the light up ensuring others to see you hundred of meters away.
DynaStrobe is robust, IPX 4 Weather Resist Construction and blink automatically without switching it ON. It is powered as it goes!