Features: Functions: It's designed to create waves in the fish tank, help fish shape its body, blow away the residue, and increase the concentration of oxygen. Strong power: The propeller-shaped impeller can provide strong power to simulate the wave of the river. Therefore, the filtration effect can be enhanced. Fish protection: The filter cover can prevent fish from entering the inner part. Otherwise, the fish might get hurt and the machine damaged. Mute operation: The pump runs in silence, which will not disturb your sleep. Magnetic mount: You can move the magnetic outside the tank to adjust the position of the pump which is more convenient and safer. Any problems, feel free to contact us. Honor to serve you! Specifications: Name: Wavemaker Model: SW-2/SW-4/SW-8/SW-15(optional) Material: ABS Color: Black Voltage: AC100-240V Power: 5W/10W/23W/40W(optional) FMAX: 2500/4000/8000/13000L/h Size: 4.5*7cm/4.5*7cm/5.8*8.8cm/7*10.3cm(optional) Package information: Size: 13.6*13.8*9cm Weight: 580g Package List: 1*Pump 1*Controller 1*Instruction