1Soft shockabsorbing rubber pad can absorb sound to a greater extent, reduce the friction of the air pump, and make the noise lower. 2Smart chip automatically switches to implement poweroff protection. The lithium battery uses a protection chip, which can be plugged in for a long time without affecting the battery life, and it can automatically switch to the lithium battery for power supply when the power fails. 3Long battery life, working modes include intermittent work and continuous work mode. One machine for both indoor and outdoor use. 4The power input can also use the USB interface, which can be powered by mobile phone power supplies, power banks and other power sources. 5Builtin largecapacity lithium battery, which can be recycled more than 500 times. Automatic protection when the battery is full. 6The external power supply is automatically charged, and the four blue indicator lights show the battery status, so you can keep track of the battery usage status. 7Tempered glass panel, antisplashing, UV frosted treatment, high temperature resistance, glossy paint surface. Item Type: Aquarium Air Pump Material: Plastic + Tempered Glass Product Color: White Product Size: Approx. 7.3x7.3x4cm / 2.9x2.9x1.6in Outer Diameter of Stoma: 4mm / 0.2in Product Weight: Approx. 251g / 8.9oz Product Voltage: 220V Battery Type and Capacity: 1 x Lithium Battery (1500mah) (built-in) Power: 3W Outer Diameter of Stoma: 4mm Exhaust Volume: 1.5L/min (single Hole) Exhaust Pressure: 15kpa Air Volume Adjustment: Non-ajustable Uses: Air Pumps for fish tanks and outdoor fishing. 1 xOxygenPump 1 x Charging Cable 1. After shutting down, it is necessary to prevent water from returning from the air pipe to the air intake pump and causing damage.2. When using, the air pump must be higher than the water level or used with a stop valve (purchased separately) When the air pump is not in use, it should be unplugged and stored in a dry place.3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.