Feature: 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 GeneratorMaterial: PlasticColor: As Picture ShownWeight: Approx. 480.0g/16.9ozPurpose: Aquarium water purification and algae removal Power: 6W Ozone Amount: 120mg Instructions for adjusting knob: 1. First press the adjusting knob down, then turn the adjusting knob 2. The indicator light in the work display area is on, and it is adjusted to the required work state 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. Package List: 1 x Aquarium Ozone Generator1 x Hose1 x Air Check Valve