The solar panel converts sunlight energy into electricity during the day. The photocell automatically turns the light on at night with the electricity stored in the batteries. It requires no wiring, because it runs off the sunlight energy to recharge the batteries so there is no cost to run the solar cap. Specifications: 1.Waterproof 2.Solar panel: 0.26 W. 17% efficiency. 3.LED: 4 LED 4.Li-ion battery: 1.2 V 900 mh 5.No batteries, no cables, & easy to install 6.LED span life: 100000 Hrs 7.Solar charging time: 8 Hrs 8.Auto-light at night 9.Li-ion battery span life: 500 circles 10.Solar panel span life: more than 5 years 11.Light type:warm light,white light Installation: 1.Turn the auto/off switch to on. 2.Secure solar fixture to desired location using two mounting screws provided(pre-drill pilot holes to easily fasten screws). 3.Remove the thin clear plastic film from solar panel. 4.Allow at least 8 hours of sunlight to fully charge the battery. To Replace the Batteries(battery relacement is about 1-2 years): 1.Remove the 2 mounting screws. 2.Turn the switch to off & remove the 3 screw located on the back of the fixture. 3.Replace the battery with a new AA size 1.2V NI-MH rechargeable battery. 4.Re-assemble and turn auto-off switch to on. 5.Allow the fixture to receive a full 8 hours of sunlight to allow the rechargeable battery to reach maximum capacity. Package included: 1x solar light 2x screws 2x nuts 1x user manual