Specifications: Because this air pump has compact sizes which can apply to different fish tank to use for producing oxygen for plant and fish, you can observe easily with plate smooth surface.Undoubtedly that this air pump has small sizes for you to choose to apply to different fish tank and simple to operate, it is also convenient to observation with plate smooth surface.Features: There is no doubt that your fish will not be hurt by using this air pump, which has high dissolve oxygen rate, it can provide enough water circulation in solar power in fish tank.Definitely, this air pump will be effective to produce enough oxygen and fine bubble for fish, which is harmless and safe. And it has high dissolve oxygen rate for you to produce water circulation in solar power.It is suitable for placing in fish tank to create oxygen compatible with water plant and fish.Solar Panel: 15cm x 15cm/5.91" x 5.91" (Approx.) Cable Length: 300cm/118.11" (Approx.)notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. How to Use: Press and hold to turn on the default for continuous oxygen supply, and then click for intermittent oxygen supply (stop for 2 seconds and open for 8 seconds), and then long press to turn off; the blue light will turn on when working, the red light will turn on when charging, and the red light will flash quickly when the battery is low. The red light is always on when fully charged, and you can take oxygen while charging.Package Includes: 1 x Oxygen Pump 1 x Solar Panel