Solar cell: poly-crystalline silicon / single-crystalline siliconLight source: super luminosity LED;Luminous mode: Constant TypeWork time: more than 30 hours for constant type (full charge constant ON)Work temperature: -25 to +75 degree C.Material of light: polycartonateResist compression: 20 tons Waterproof grade IP>67Life: >5 years (Ni-MH) or >15 year ( Super Capacitor) View distance: over 800mGuarantee period:14 monthsInstallation remarks: gum fix