Features: 1.Release high concentration of active ozone every minute, and actively decompose harmful substances such as formaldehyde and nitrite. 2.It only decomposes harmful things in the water without harming the fish, no need to use it every day, simple and worry?free. 3.take no space in the fish tank, can be used as soon as it is connected with the air pump. 4.With the function of Deodorizes and purifies fish tank water, clean algae, necessity for aquarium. 5.Energy saving and low power consumption, with adjustable knob for needing work status. Specification: Item Type: Aquarium Ozone Generator_x000D_ Material: Plastic_x000D_ Color: As Picture Shown_x000D_ Weight: Approx. 480.0g/16.9oz_x000D_ Purpose: Aquarium water purification and algae removal_x000D_ Power: 6W_x000D_ Ozone Amount: 120mg_x000D_ _x000D_ Instructions for adjusting knob:_x000D_ 1. First press the adjusting knob down, then turn the adjusting knob_x000D_ 2. The indicator light in the work display area is on, and it is adjusted to the required work state_x000D_ _x000D_ 3. Stop rotating the adjusting knob, the indicator light will flash until the indicator light is on and it will automatically enter the working state PackageList: 1 x AquariumOzoneGenerator 1 x Hose 1 xAir Check Valve