1. Ultra Quiet Design: with the use of durable small motor, the sound of waterfall pumps will be very small. 2. Mini Size pump dimension: 1.97 x 1.73 x1.26inch or smaller size:1.61*1.41*1.22inch.The mini size makes this submersible pump easy to hide or disguise in the water.The watfall pumps perfect for small size fish tank, aquariums,pet cat dog water fountain, waterfall in terrarium, tabletop fountains, spout, water gardens and hydroponic systems. 3. Water flow control : Designed with a adjusting knob, allowing to adjust the water flow rate, the maximal flow rate can be up to 70 GPH. It can elevate column of water up to 2.2f.