Item Type: Fish Tank Oxygen Pump Material: ABS Battery Type: Lithium Battery Battery Model: 18650 Battery Capacity: 1200mAh (shipped with built in battery) 1,Ultra Quiet Design: Aquarium oxygen pump is so quiet that you can sleep near your bed and it won't wake you up! 2,Slip Resistant: Fish tank air oxygen pump has 4 non slip rubber feet at the bottom to reduce noise and prevent slipping. 3,Pure Copper Motor: Quiet oxygen pump pure copper high frequency stable voltage, low resistance, reduce consumption, stable oxygen supply. 4,Rechargeable Air Pump: Quiet aquarium air pump can be plugged in and charged for immediate use. (with charging cable) 5,Safe to Use: Air aerator for fish tank switches from electric to battery when the current is interrupted. Can be used indoors and outdoors.When the air pump is not in use, it should be unplugged and stored in a dry place, and the rechargeable type should be kept away from flammable and explosive materials. The following figure shows the disassembly of the product and the simple troubleshooting method. 1 x Fish Tank Oxygen Pump 1 x Air Pipe 1 x Air Stone 1 x Charging Cable