SPECIFICATION: solar panel: Polysilicon 20% efficiency. NI-MH AA battery: 1000mah/1.2v, 1LED, 10lumen DUSK TO DAWN: The solar light insert absorbing solar energy during the daytime, and lights up at dusk automatically. Light up 8h in summer and 4h in winter after 8h fully charge. SIZE: 3.3"x2.1"x(0.94-1.45) Waterproof IP55 and weatherproof NOTE: Please contact the seller to ask for a free solar light insert replacement if your GOODFOEVER solar wall lights is within warranty period.