Features: 100% brand new and high quality. Battery Backup Aquarium Air Pump Save your fish in a power outage Or for traveling Operated by Two "D" type battery (not included) Pump can be used for transportation of fish, power outages or for the purpose of cleaning equipment. Air volume: 2L/min Usage: all kinds of aquarium emergency oxygen and a small amount of wild fishing or transport live fish, fresh oxygen. Operation: 1. To install two pieces of single battery which are additionally sold. 2. To insert the enclosed ethylene plastic tube(with air ring)at the air outlet. 3. To insert the end with air ring into the water then connect to the power supply. Specifications: Air volume: 2L/min Power: 0.5W Battery: 2*1.5V D type battery(not included) Size: 14.5*7.8*4.3cm Material: ABS Plastic Color: Blue Net Weight: 182g Package included: 1X Air stone 1x Battery pump (other accessories are not included) 1X Oxygen Tube