Adjustable Water Flow: This aquarium pump has an adjustable knob for easy adjustment of the flow rate. Maximum flow: 3000L/H, H-Max. [20-30 Decibels, Noise Reduction Design] The pure copper wire motor design is very energy efficient and creates a quiet and pollution-free environment. The operating noise level is around 20-30 decibels, less than 40 decibels, making you feel comfortable and not disturbing the outside world. 【Three Multifunctional Nozzles】Equipped with three nozzles: one with a diameter of 1.3 cm, another with a diameter of 1.6 cm, and the remaining one with a diameter of 1.9 cm, providing different flow effects. 【4 Powerful Suction Cups】The bottom of the submersible water pump is equipped with four powerful suction cups, ideal for vertical and horizontal installation. 【Detachable and Cleanable】Detachable without tools, easy to disassemble and easy to clean. Ideal for aquariums, tabletop fountains, water gardens, hydroponic systems, and more.