Feature: 1. [Super Quiet] Aquarium air pump is set to 40dB, very quiet. There are 4 non slip rubber feet on the bottom to prevent sliding and reduce noise. Give you a quiet environment. 2. [Pure Copper Motor] Fish tank air pump adopts full copper high frequency voltage regulator transformer, low resistance, low consumption and stable oxygen supply. 3. [Powerful Motor] Fish tank oxygen pump provides consistent performance with a powerful motor that can easily provide high volume and consistent bubbles. 4. [Rechargeable] Silent bubbler pump can be plugged in or recharged for use. Switches from electric to battery when current is interrupted. Can be used indoors or outdoors for fishing. 5. [Safe And Energy Efficient] Aquarium oxygen pump creates a healthy environment for your fish, corals and any creatures in your aquarium marine system. 6. [Fishing Equipment] Always have an air pump with you when you go out fishing. Without oxygen pump to supply oxygen, the fish may be deprived of oxygen for a long time. Specification: Item Type: Aquarium Oxygen Pump Material: ABS Product Model: SB 268 Battery Type: 1 x Lithium Ion Battery Battery Model: 18650 Battery Capacity: 2200mAh (Shipped with Built in Battery) Charging Quantity Display: Four lights are indicated 100%, the fourth light flashes 75%‑100% the third light flashes 50%‑75% the second light flashes 25%‑50% the first light flashes 0‑25% Discharge Quantity Display: All four lights on 75%‑100%, 50%‑75% three lights on, 25%‑50% two lights on, 0‑25% one light on Available Charger: Charging Head, Mobile Power, Car USB Power, etc.. Package List: 1 x Aquarium Oxygen Pump1 x Charging Line2 x Air Hose2 x Air Stone1 x Instruction Manual Note: 1. This product cannot be immersed in water.2. When using the air pump, it must be above the water surface. If the air pump is below the water surface, a check valve must be installed in the middle of the air pipe (not included).3. If the air pump power cord is damaged and the air pump is inadvertently immersed in water, please immediately cut off the power and stop using it.4. When installing or disassembling and cleaning the air pump, you must first unplug and disconnect the power supply to ensure safety.5. Clean or replace the air tube and air stone frequently to achieve maximum gas flow and extend the life of the air pump.6. It is recommended that all water appliances are connected to a socket with a safety switch.7. When using outdoors, avoid direct sunlight and rain.8. In sleep mode, it will automatically enter sleep mode again after being woken up for 5 seconds even if it encounters strong interference. And in sleep mode, it can still charge normally and indicate the battery level, and stop charging when it is full.