Features: 1. Solar oxygenator: Up to 0.9l/min high airflow, designed 100 degree folding solar panel, easy to adjust a best angle to absorb solar energy. 2. 2 charging methods: Not only can be powered by solar energy, but can be charged by dc power with built-in input port. Rechargeable battery inside to store power and support the night work. 3. Long working time: Built-in 2200mah large capacity battery, the oxygen pump provides up to 20 hours working time once fully charged. 4. Safe to use: Imported single-chip microcomputer intelligent control, support constant pressure and constant current charging, overload discharge protection and low electric alarm. 5. Wide application: Widely used for adding oxygen in various aquariums, aquarium, swimming pools, ponds, especially suitable for the power failure emergency oxygen increasing, the wild fish oxygen increasing and small amounts of aquatic transport oxygen increasing. Description: This product is an AC/DC dual-purpose oxygen pump. It adopts pure copper movement, high-quality lithium battery, and has a cycle life of up to 500 times. It has the characteristics of small size, low noise, large air volume and long life. Specifications: Size: 13*8*5cm Solar panel: 5V 290MA Battery: 18650 lithium battery 3.7V 2200mAH Oxygen pump: DC micro air pump 1.8V 150MA Noise: 50dB Minimum airflow: 0.3L/min Air nozzle specification: ?4.4MM (the external air nozzle of the product is ?5.1MM) Working power range: 3.2V-4.2V 90MA Low battery indication voltage (green light flashes): 3.3V Full powers indication voltage (red light on): 4.0V Charging protection voltage: 4.2V Working time: about 15-20 hours when fully charged Charging method: sunlight charging; USB AC charging Charging time: about 15 hours for sunlight charging; about 3 hours for USB AC charging Package Included: 1 pc * Air Pump 2 pcs * Air Stones 1 pc * Three-Head Connector 1 pc * Dual Head Connector 3 pcs * tube (2 tubes is 1m length, 1 tube is 30cm length) 1 pc * USB Cable 1 pc * User Manual Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object. Shipping 1.If you need to buy in bulk, please contact, we will reply in 24 hours. 2.We are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control. 3.Usually product Reaches after about 12-45 business days depending on destination. If you have not received your shipment within 45 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Refund or resend product will be offered if item still not received. 4.We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important. We ask you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. It is impossible to address issues if we do not know about them! THANK YOU :)