Feature: 1. Super mute design air pump, low power consumption, unique appearance. 2. High efficiency and energy saving motor technology, stable performance, safe and reliable. 3. Install a check valve when using to prevent the battery from running out and burning the machine. 4. Professional manufacturing, easy to install and use. 5. Suitable for fishing oxygen supply power failure emergency use. Specification: Condition: 100percent brand newItem type: Oxygen PumpMaterial: ABSColor: whiteWeight: Approx. 219g Exhaust volume: 2L/min Pressure: >0.02mpa Power: 2W Voltage: 220-240V Battery model: 2 x D batteries Battery capacity: 1235mah . Package List: 1 x Oxygen Pump1 x Water pipe with air stone