RivenAn 1.8 Watt Solar Power Water Pump For Water Cycle/Pond Fountain/Rockery Fountain Safe and easy to use as it has no electric outlet or external battery. Eco-friendly design gives you a low carbon consumption life style. Runs automatically, no battery or electricity needed, works in full sun only (not shade or cloudy day). Decorates your garden if you have a pool or big aquarium. Suitable for bird bath, fish tank, small pond, garden decoration, water circulation for oxygen, etc.