Science Technology Hand Crank Twinkle Lights Work Just Like a Pencil Sharpener By Kristin Underwood Writer American University Columbia University Kristin Underwood has more than twelve years in the solar industry and currently runs her own solar consulting service. She wrote for Treehugger from 2006-2009. our editorial process Kristin Underwood Updated October 11, 2018 Migrated Image Share Twitter Pinterest Email Science Space Natural Science Technology Agriculture Energy The folks behind Yanko Design are always thinking, and lately their thoughts are stuck on solar and renewable energy gadgets. The latest design, a hand-crank, "Eco-Twinkle Light" takes the idea of renewable energy, this time human-powered, and creates a light that is easy for kids or adults to operate. If you find yourself camping in some remote location and need to see whether that is a Snickers Bar or a scorpion you're about to grab, having a handy ready-to-go hand-crank light is perfect. Or if you've got kids with unlimited energy, let them take responsibility for keeping the lights going at base camp with these Eco-Twinkle lights by Yanko Design. The lights come in a couple of shades, from white to orange to a light green/blue color. To turn the light on, simply turn the crank to generate some battery power. If your light is already charged, simply push the on/off button on the top of the light for instant illumination. By taking simple idea of a pencil sharpener, that uses simple human power to grate and shapen a pencil, the designers at Yanko Design used the same gear and grating idea to charge a battery and voila, the Eco-Twinkle Light was created.