Features Solar-Powered and USB Rechargeable: Absorbs sunlight to convert solar energy into electricity, providing an eco-friendly and cost-effective power source. Can also be charged via USB for non-solar use. 3 Adjustable Working Modes: Offers high gear, low gear, and 10-second on-off cycle modes for versatile and customizable oxygenation based on specific needs. Durable and Portable Design: Constructed with high-quality ABS materials and lightweight solar panels, ensuring safety, sturdiness, and easy transport for various aquatic environments. Wide Application: Suitable for oxygenation in aquariums, fish tanks, swimming pools, and ponds, especially beneficial for emergency oxygen and hypoxia situations. Versatile Usage: Ideal for use as an air pump, solar air pump, electric air pump, oxygen pump, or solar oxygen pump in a range of aquatic settings. Specification: Item Type: Solar Air Pump Material: ABS and rubber Weight: Approx. 485g / 17.11oz Product Size: Approx. 15 x 4.7cm / 5.91 x 1.85in Solar Panel Charging Time: 25H USB Charging Time: 5H maximum Air Volume: 0.9L/min Minimum Air Volume: 0.5L/min Battery Type: lithium battery (battery included) Battery Model: 18650 Voltage/Capacity: 3.7V 3600mAH Voltage Range: 3.0V-4.25V Maximum Working Current: 150±10MA (high gear); 75±10MA (low gear). Quiescent Current: less than 500UA Discharge Protection Voltage: 3.0V Charging Protection Voltage: 4.25V Package List: 1 x Tube 1 x Adapter Tube 2 x Oxygenation Head 1 x Air Pump(battery included) 1 x USB Cable 1 x English Manual Package List 1 x DIN-Rail Electric Meter 1 x Manual 4 x Accessories