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Product: Lithium Battery Sobo Oxygen Pump 1. Use all-copper movement, professional energy-saving. 2. Use anti-skid and shock absorbing foot pads to reduce vibration transmission. 3. Built-in high-capacity battery / 70 hours battery life 4. Super wind volume: 28kpa Can drive a high-pressure nano-gas disk. 5. 4-level battery display 6. Can be used while charging Intermittent work: 10 seconds work, 10 seconds rest. Automatic switching of lithium battery power supply in case of power failure Quiet experience at bedroom level: 30~40 decibels. Suitable for all types of aquariums. Suitable for fishing and providing oxygen to fish. Go out with a power bank Double the battery life 2800mAh battery capacity, more than similar products. Use a normal USB charger at home. Parameter Description sb-218-single hole Length, width, height 12*7*4.8 cm. Power: 1W Air pressure 0.018Mpa*2 Air volume: 3L/min Net weight: 300g Applicable aquarium: below 60 cm. Battery capacity: 2600mAh The package includes: Aquarium air pump * 1 Air hose * 1 Air Bubble stone *1(White or black) USB Line * 1 Description *1 SB-228-Double Hole Length, width, height 12*8.5*4.8 cm. Power: 2W Air pressure 0.02Mpa*2 Air volume: 3L/min*2 Net weight: 430g Applicable aquarium: less than 1m Battery capacity: 4800mAh The package includes: Aquarium air pump * 1 Air hose * 2 Air Bubble stone *2(White or black) USB Line * 1 Description *1