Note：Size 1:2 Meter Tube With Air Stone Size 2:Aquarium Air Pump Material: ABS Plastic Color: As the picture show Feature: 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. Air volume: 2L/min Power: 0.5W Battery: 2*1.5V D type battery(not included) Battery pump Size: 13*7*4cm/5.12"*2.76"*1.57" Note: Air Stone have two types, we will send by random! Quantity:1Set Package includes: Aquarium Air Pump: 1Pc x Battery pump, 1Pc x Air stone, 1Pc x Oxygen Tube 2 Meter Tube With Air Stone: 1Pc x 2 Meter Aquarium Tube, 1Pc x Air Bubble Stone(Send by random)