This is an RF-370CA 10750 Mini Air Pump DC12V. It is often used for aquarium tank oxygen circulation and DIY projects. It works by circulating fluid within the pump head, which creates a vacuum. It is widely used for building science projects fire-extinguishers, fire fighting robots, DIY Hydraulics, waterfalls, Oxygen, Air, fountains, and plant watering systems. Features Good Quality Pump Operating Voltage 12VDC Low Noise Operation Specifications Product RF-370CA 10750 Mini Air Pump Supply Voltage 12V DC Type Air Pump Material Metal, Plastic Length 59mm Dia/Width 27mm Outlet Length 6.2mm Outlet Nozzle Diameter 3.0mm Usage Type Air Oxygen, Aquarium tank Country of Origin China