This is an oxygen pump which is made of materials for safe and durable long time use The mute pump is almost no sound and is suitable for the quiet environment to feed fish, such as living room, bedroom, outdoor fishing and so on. Features - Color: Blackwhite - Material: ABS. - Size: About 11x7.8x4.8cm/4.33x3.07x1.89inch. - Power: 2W. - Battery capacity: 2200 mah. - USB cable length: 100cm. - Suitable for 0-100L fish tank. - The oxygen pump is equipped with a USB interface. - The mute pump is almost no sound and is suitable for the quiet environment to feed fish, such as living room, bedroom, outdoor fishing and so on. - With a small size, it is easy to carry around and suitable to use outdoors. - Low power can save energy and it is more economical. - Producing more bubble and increase more oxygen. Packing list: 1 x Oxygen Pump 2*bubble stones 1* 100cm charging cable 2* 80cm tube