1、[Rechargeable] Aquarium oxygen pump with built in 2400mAh rechargeable lithium battery, divided into two power supply modes. Under full power, the continuous mode can work up to 12 hours and the indirect mode can work 24 hours. 2、[Power Outage Response] When the power goes out at home, the aquarium air pump will automatically switch to the lithium battery power supply mode, and automatically switch to the power supply mode for charging when the power is on. 3、[Dual Outlet] This fish tank air pump is designed with dual outlets, which allows you to place two air stones of the aquarium bubbler in different locations of a fish tank to make the oxygen distribution more even. 4、[Compact And Portable] Small fish tank oxygen pump, easy to carry, suitable for outdoor fishing, fish transportation and power outages and other scenarios. Can be charged by laptop, mobile power, energy saving and environmental protection. 5、[Quiet] The aquarium air pump has a sturdy and durable ABS shell with 4 non slip silicone cushion feet at the bottom to reduce vibration and noise. With stainless steel back clip, you can attach the pump to the tank or clip it on your belt when you go out. 1 x Aquarium Oxygen Pump1 x Back Clip Accessory1 x Screw1 x Hose1 x Y Tube Head1 x Charging Cable2 x Bubble Stone  Item Type: Aquarium Oxygen PumpMaterial: ABSSize: Approx. 120 x 75mm / 4.7 x 3inBattery Capacity: 2400mAhBattery Type: Lithium Battery (Shipped with Built in Battery)