1Large gas volume, very silent, AC and DC, can be stored and charged for much convenience. 2Features with even and fine air discharge, power saving and large output, longer working time. 3Sensitive touch operation, intelligent onekey intermittent, simple operation, and effort saving. 4Largecapacity battery, suitable for a variety of outdoor, transportation and other scenarios. 5Less than 40dB silent will not disturb you and your familys rest, more reliable and practical. 6The appearance is simple, generous and charming, with soft foot pads at the bottom to protect the body and reduce friction. Condition: 100% Item Type: Aquarium air pumpMaterial: Plastic Color: As pictures shown Uses: Aquarium accessories, oxygen booster pump, fresh-keeping and oxygenation for living body Battery Type of Oxygen Pump: Lithium battery(included) Battery Capacity: 8800mA Battery Model: None Battery Life: About 60 hours Product Gas Volume: 2.5/min x 2 Product Model: ZY-538 double hole Product Size:Body Length: Approx.17.5cm / 6.9in Width: Approx.12.5cm / 4.9in Height: Approx.9cm / 3.5in Tips: 01. Small gas volume of pump Check the installation direction of the check valve first. The arrow on the check valve points to the bubble stone. If the direction is reversed, it will result in little or no air output. 02. Small air bubbles of bubble stone Unplug the connection between the air stone and the hose, and then soak the air stone in water for one minute, then the oxygen can be exploded 03. Clean the filter cotton regularly Every two months or so, remove the filter cotton at the bottom of the air outlet and clean it (Note: the cleaned filter cotton needs to be dried before being put in) 1 x Oxygen Pump1 x Plug1 x USB Data Cable2 x Trachea Tee Joint1 x Manual1.Theaeratorpumpisnotwaterproof,pleasedonotdive.2.Thepowercordcannotbereplaced.Ifthepowercordisfoundtobedamagedduringuse,donotcontinuetouseit.3.Payattentiontothepositionoftheaeratorpump,whichmustbehigherthanthehorizontallevel.Ifitislowerthanthehorizontallevel,pleaseconnectacheckvalvetopreventwaterfromflowingintotheequipment.Ifwaterenters,theaeratorpumpwillburnoutanditwillbeirreparable.