Solar Light Fence Post Cap Deck Light for 4x4 Post 3 Rechargeable Ni-Cd AA Batteries Each Light (included) Contains 1x10mm Big Bright Warm White LED Which Can Last Up to 100,000 hours With Light Sensor, It Automatically Turns On at Dusk and Off at Dawn Solar powered, No Wiring, Easy to Install Product Size: 4"x4"x6" or 4"x4"x9" with Stake