It’s a lamp, USB port and phone charger all rolled into one tiny device the size of your palm. After three years of research, Sachin Kumar from IIT-Bombay invented this solar energy device. His idea was inspired by the need to find alternative options to electricity that does not use kerosene. He teamed up with three of his friends to form Illumind Solartek in 2015, where they’re now manufacturing more of these devices. It sells like hot cakes too; the first batch of 4500 units got sold out in 10 days through door-to-door sales. It costs between Rs 699 and Rs 999..