Portable Aeration Oxygen Pump Fish Tank Aquarium Ultra Silent USB Charging Air Compressor Dual Purpose AC DC Oxygen Pump Feature: 1. It can be recharged and has a wider range of applications. 2. Small size, easy to carry, suitable for outdoor use. 3. The silent pump has almost no noise, suitable for a quiet environment.. 4. Bottom power consumption and large volume, environmental protection and power saving. Specification: Material: ABS Parameter: Model Battery Capacity Power Vent Air volume Weight SB-168 1100mA 1W 1pc 3L/MIN 280g SB-268 2200mAh 2W 2pcs 2*3L/MIN 350g Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3mm measuring deviation due to manual measurement. 1 X Water Tank Aerator