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Zacro AH823 Submersible Aquarium Heater is an upgrade version can control and adjust the temperature manually. Notices: 1.Usage: Before powering, Make the heater is completely submerged in the water. 2.Removal: Before removing the heater out from the water, make sure the heater is unplugged to avoid dry heating. 3.In order to maintain constant and stable temperatures of the water, the product is operating as staged heating, and the aquarium heater will work for a while, and then stop heating some time, normally the interval is 5-10 minutes. Package included: 1 x Zacro Submersible Aquarium HeaterWarranty: 18-month warranty.