The solar panels convert sunlight into electricity during day time and recharge the battery. At night, the light turns on automatically. There are absolutely no wiring to the lights and they are easy to install. These lights can light up nearly whole night when fully charged. Automatic sensor activates at dusk with AUTO/OFF switch. Each light is made of stainless steel durable for years of use in all weather conditions. These lights are ideal for areas where conventional electrical supply is not available. These solar lights are the perfect ideas for your indoor or outdoor staircase This product ships in approximately 1 days