Jun 12, 2022 · Solar Road Stud: Battery Type: Ni-Mh Battery: Use life: 3-5 years: Operating time: 72 hours after full charged: Shell Material: Aluminum alloy and Acrylic reflectors: Solar Panel Cover: Special PC (Polycarbonate) Solar cell type: Mono crystalline: LED Quantity: 2 pcs or 3 pcs Per side: LED Color: All 5 colors (White, yellow, red, blue, green