JOYOSOLAR has launched the INKSOLAR-S1, a six-color ePaper smart badge that combines the company's own perovskite solar cell, an ePaper screen and Apple Find My in a 20-gram wearable. The 1.54-inch 240x240 display supports 3-bit black, white, red, yellow, blue and green, while indoor light keeps the 180mAh battery topped up.