1. An excellent air pump is used for water circulation and oxygen supply in the aquarium, improving water quality and providing a comfortable environment for your fish. 2. It is made of high - quality ABS material, which is strong and durable. The advanced technological design ensures smooth and quiet operation. 3. It is powered by solar energy, eliminating the need for batteries or electricity, thus being energy - saving and environmentally friendly. 4. It has a built - in 1800mAh high - capacity battery. After a full charge, it can work for up to 22 hours. 5. The powerful and efficient air pump can meet most of the air requirements of the aquarium. 6. Specifications: - Type: AC air pump - Material: ABS - Battery: 3 x 7V 1800mAh 18650 lithium batteries (included) - Working voltage: 3.0 - 4.25V - Working time: Approximately 22 hours (when fully charged) - Solar battery: 6V / 2.5W / 450MA - Dimmable control: No 7. Air pump: - Rated voltage: 3.5V - Maximum current: 450MA - dB: 50 dB - Minimum air volume: 1L/min 8. Delivery scope: - 1 * Aquarium air pump - 1 * Solar battery - 1 accessory pack - 2 x Air stones - 2 tubes