Features： 1、High Oxygen Production: The oxygen pump has a single hole outlet, and can produce a great amount of oxygen. The bubbles are uniform and dense, which is less than or equal to 100nm. 2、Noiseless: The mini oxygen pump adopts the outer sound insulation design to block the mechanical noise, and the inner diaphragm reduces the working vibration sound to ensure quiet operation. 3、Silicone Damping Pad: This aquarium oxygen pump is equipped with silicone damping foot pad, which can absorb sound to a greater extent, reduce air pump friction, and has lower noise. 4、Portable: The USB oxygen pump is small in size and light in weight, which is very convenient to carry and store, which will not add extra burden to you. 5、Applicability: The USB oxygen pump is suitable for 80cm water depth, and the oxygen pump can be used in the fish tank at home or fishing outdoors. Specification： Item Type: Oxygen pump Material: Plastic Weight: Approx. 265g/9.3oz Model: AQ MINI 198 Rated Power: 1W Battery:1500mAh, lithium ion battery, 18650 model(Shipped with built in battery) Voltage: DC 5V Working Pressure: 18Kpa Exhaust Volume: 1500mL/min Continuous Mode: 17 hours Intermittent Mode: 34 hours Size: 11x7x4cm/4.3x2.8x1.6in Package List： 1 xOxygen Pump 1 x Air Tube 1 x Airstone 1 x USB Line 1 x Instructions