Feature: 1. ABS Shell: Fish tank air pump has ABS noise reduction shell technology, accuracy CNC machine cutting, surface anti oxidation treatment, good sound insulation, strong bearing capacity. 2. Quiet Operation: Fish tank oxygen pump baby sleep grade mute design, multiple shock absorption and noise reduction, ultra quiet ≤30dB. With silicone shock absorbing pads, reduce vibration friction and reduce noise. 3. Dual Mode: Aquarium air pump can switch between continuous oxygen supply and intermittent oxygen supply with one key. You can choose the mode according to your needs, which is convenient to use. 4. Intelligent Protection: Fish tank aerator auto starts when power off, both AC and DC use. Using intelligent protection chip, it can be charged while working, after fully charged, it will only work without charging. 5. Dustproof USB Port: Oxygen pump for fish has a dustproof USB port, which is protected by a sealed screw cap. There is a fixing clip at the bottom, which can be clipped on the waist or on the wall of the fish tank. Specification: Item Type: Fish Tank Air Pump Material: ABS Single Hole Air Pump Size: Approx. 7x12cm / 2.8x4.7in Double Holes Air Pump Size: Approx. 8.5x12cm / 3.3x4.7in Use: Fish Tank, Outdoor Fishing Oxygen Pump Power: Single Hole 1W, Double Hole 2W Air Volume: Single Hole 3L/min, Double Hole 2x3L/min Battery Type, Capacity: (included) Single Hole Air Pump: 1 x Lithium Battery (2600mAh) Double Holes Air Pump: 1 x Lithium Battery (4800mAh) Suitable for Fish Tank: Single Hole 30-50L, Double Hole 30-100L. Package List: 1 x Oxygen Pump2 x Hose2 x Bubble Stone1 x Data Cable1 x Manual Note: 1. Please allow some errors due to manual measurement.2. Whether it is off or on, plug in the charger, that is, after the 220V call, automatically charge the battery.