It is completely controlled by solar energy, requires no battery or electricity. No battery inside, a real ecological solar pump. Simply place the solar fountain. Pump into the water and the pump will work automatically in 3 seconds once it gets enough sunlight (putting into the water is to deflate the air in the pump) . Just put the pump in the water and let the sun do the rest. The more sunlight it receives, the better it works. This eco-friendly solar pump is ideal for bird baths, aquariums, small ponds, swimming pools, gardens, water circulation for oxygen. Your garden is sure to attract the attention of passers-by. Let the solar water pump decorate your garden in such an interesting way.