Features: Easy to install, no tools required Can be left outdoors all year round Keeps fish and pond-life healthy Helps keep your pond clean and algae free Suitable for small to medium sized for ponds, Sea fishing,fishing enthusiast Specifications: Solar panel: 5V 290MA Battery: 18650 lithium battery 3.7V 2200mAH Aeration pump: for DC miniature air pump 1.8V 150MA Noise: 50dB Minimum airflow: 0.3L/min Air nozzle specification: φ4.4MM (the external air nozzle of the product is φ5.1MM) Product working power range: 3.2V－4.2V 90MA Low battery indicator voltage (flashing green): 3.3V Full power indication voltage (red light on): 4.0V Charging for protection voltage: 4.2V Working time: about 20 hours Charging method: solar; 5V 1A power adapter Size: 13x8x5cm/5.12x3.15x1.97in Package Includes: 1 set Oxygen Pump note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. IP64 waterproof rated air pump, DO NOT immerse it into water. Be careful to protect the solar panel to avoid any damage. Please turn off the oxygen pump when charging.