Item Type: Water level controller_x000D_ Pattern: 220V 15A AC_x000D_ Switch Life : 1 million times or more_x000D_ Water Channel Pressure: Equal to atmospheric pressure_x000D_ Temperature Range: 4C ~ 80C_x000D_ Principle: Using the principle of different weights when two float balls are immersed in water and in the air, the pump is automatically controlled to pump water or water according to the lifting of the water surface._x000D_ Installation Method:_x000D_ 1. The optimal fixed position of the controller should be at the center of the top of the sink. If you want to fix it on the inner side of the sink, you should take care to avoid the float ball hitting the groove wall._x000D_ 2. The hanging ball is attached to the controller wire, and the control range is from the center of the upper ball to the center of the lower ball, which can be freely adjusted as needed.