Drawing energy from the Sun, these solar lights not only save a lot of energy but also a lot of money.The Solar Home Lighting Kit has a advanced solar charge controller also inbuilt can be charged via solar or even by AC power using the included DC adapter through electricity. There is a small green color LED indicator to show charging indication and also Low battery cutoff red indicator to protect the battery from deep discharge. This product has many variations by way of battery capacity (stored power) and solar panels (battery charging)that can be used all offering different back up times otherwise the functions remaining the same.