Two Power Supply Methods: Built-in 2600mAh rechargeable lithium battery, compatible with USB charging; when fully charged, it can work continuously for 12 hours and the working time in indirect mode is 24 hours. Power-Off Self-Test: In case of sudden power failure, the Oxygen pump automatically switches to lithium battery power mode. After powering on, it automatically switches to power mode and charges the lithium battery, ensuring safety at home. Portable Aquarium Pump: with stainless steel mounting clip on the rear, it clings to the aquarium; Mini aquarium air pump and is easy to carry, convenient for outdoor fishing and fish transportation. Important Parameters: 3W Aquarium Bubbler for 10L-50L, with good energy saving performance; non-slip cushioning feet at the bottom, and the mute effect is remarkable. Special Reminder: The main part of oxygen pump is not waterproof, cannot be placed in the aquarium directly. Please read the instructions carefully. Product information: Weight: 0.46 KG Size: 16.5 * 14.5 * 5.8 CM Material: ABS White color Super power Can give your aquarium high oxygen content and provide a comfortable living environment for your fish. Two working modes In case of full power, it has up to 12 hours of working time in continuous mode and 24 hours in indirect mode Portable< /p> Package included: 1x oxygen pump 2 x oxygen stone 2 x shut-off valve < p>1 x 3m hose 2 x suction cup 1 x USB charging cable