WATER FLOW CONTROL - An Adjustable Knob to control the water flow rate, so you can get just the amount of water pressure you want. Maximum flow rate: 550GPH (2000L/H). The impeller shaft is stainless steel for long life span. STRONG POWER and HIGH LIFT - Voltage:110-120V. Max Lift Height: 7.2ft. Model number is SML-630. 30W high efficiency motor for energy saving. Lift height is a max height the water goes up, after connecting the water pipe to the nozzle (Make sure the joint sealed securely and tightly) 3 NOZZLES - Each water pump has 3 nozzles for option: 0.51"/0.62"/0.75". Provide a different water flow as you desired. Threaded fittings make it more stable. Detachable and cleanable. SUCTION CUP and 5.9FT POWER CORD - Long enough cord for easy installation. 4 individual powerful suction cups help keep it in place, so you can stick it on the right side of the aquarium, either vertically or horizontally. WIDELY APPLIED - Circulate and aerate the water, making it more attractive to your fish or turtles. This submersible pump is perfect for aquarium, fountains, spout and hydroponic systems, etc. Meet UL 1081standard. FEATURES This water pump is designed for reliability and ultra-quiet operation to provide years of service, energy-saving and low power consumption. The impeller shaft is stainless steel, strong driving, long working life. An Adjustable Knob to control the water flow rate, so you can get just the amount of water pressure you want. The water pump is easy to detach to clean. 4 individual powerful suction cups help keep it in place, so you can stick it on the right side of the aquarium, either vertically or horizontally. WIDELY USED You can use this pump to circulate and aerate the water, making it more attractive to your fish or turtles. This submersible pump is perfect for aquarium, fountains, spout and hydroponic systems, etc. The pump also can be used to make outdoor fountain or waterfall for your garden. NOTE Please clean it regularly to avoid debris blockage, otherwise it makes noises. Please do not use it without water. Please put the pump into water first before connecting power supply. Please cut off power if changing water. Please cold water only.