Description: The oxygen pump with built-in rechargeable lithium battery to store power, so the oxygen pump also works outdoors, it can be powered by power bank. power supply, computer, car charger, etc. Suitable for small pond, outdoor fish tank, etc Features: [Two power modes] In the case of full power, mode continuous working time up to 15 hours, indirect mode working time 30 hours. [Large Air Volume] Quiet and stable oxygen pump with high air volume of 3 L/min or 6 L/min, provides sufficient amount of water circulation in your aquarium. [Quiet] The aquarium air pump is made of ABS thickening plastic, a super quiet air pump. [Portable Loop] Comes with a loop, can be hung on your bag, tackle box, fish tank when moving. [Widely Applicable] Suitable for home aquarium, fish tank, outdoor fishing, emergency air pump, aquarium transport, pond. Features: Types: Type 1; Type 2 (optional) Material: ABS, electronic component Color white Battery: 3.7 V, 1100 mAh (Type 1), 3.74 V, 2600 mAh