Solar panel:2.5W Battery:Ni-Cd 21.2V4000mAh Light Source:12 LEDs Lighting time:6-12 hours Technical Data(option): Solar Panel:3.5W Battery:Ni-MH 61.2V2600mAh Light Source:12 LEDS Light Time:8 hours Last for 4 days or above under bad weather conditions. Dimension:330600mm. Materials:cast aluminium PMMA.