The garden House Address Number Solar Rock has the following features: Solar powered No Wiring Powered by the sun Fast and easy to install Energy saving Recharged by solar panels under sunlight Light turns on automatically when dark Super bright LED for brighter light output Rechargeable Ni-Cd AA battery (included) Safe water resistant CE certified LED bulb never burns out Up to 10 hours of light when dark Corrosion resistant LEDs can last up to 100,000 hours Batteries are rechargeable and should last for approximately 2 years before replacing Ideal for areas where conventional electrial supply is not available.