Feature: 1. PURE COPPER MOTOR: Aquarium air bubbler pump with full copper high frequency voltage regulator transformer, low resistance, low consumption and stable oxygen supply 2. ANTI SLIP PADS AND MULTIPLE CHARGING METHODS: Aquarium air oxygen pump has 4 anti slip rubber feet at the bottom to prevent sliding and reduce noise. Multiple charging methods, easy to use 3. SUPER SILENT: Aquarium oxygen pump with ABS noise reduction shell, 40dB sound, very quiet, will not disturb your sleep, can be used indoors and outdoors 4. POWERFUL MOTOR: Fish tank bubbling pump with stable performance, equipped with a powerful motor, easily provide large capacity and stable bubbles 5. CAN BE PLUGGED IN OR BATTERY POWERED: Aquarium air pump can be plugged in or battery powered use, switch from electric to battery when the current is interrupted Specification: Item Type: Aquarium Oxygen Pump Product Material: ABS Parameters: Battery Type: 1 x Lithium Ion Battery Battery Type: 18650 Battery Capacity: 2600mAh (Shipped With Built In Battery). Package List: 1 x Aquarium Oxygen Pump 1 x Charging Line1 x Air Hose1 x Air Stone1 x Instruction Manual Note: 1 This product cannot be immersed in water.2. When the air pump is used must be above the water surface, if the air pump is below the water surface must be installed in the middle of the air tube a non return valve (not included).3. If the air pump power cord is damaged, air pump accidentally submerged in water, please immediately cut off the power and stop using.4. Installation or removal and cleaning of the air pump is, must first unplug and cut off the power supply to ensure safety.5. Clean or replace the air tube and air stone frequently to obtain the maximum air flow and extend the life of the air pump.6. We recommend that you connect all aquarium electrical equipment to a socket with a safety switch for use.7. When the product is used outdoors, make sure it is protected from direct sunlight and rain.