About this item The case is made of material High quality ABS with internal metal contacts to ensure reliable start/stop. Ultrasonic welding, sealing molding, reliable and safe, no leakage. Long service life, the number of switches up to 100,000 times.Built-in installation cabin, providing bottom/side two installation methods. Water level 55mm automatically connected;Auto disconnect 25mm.In addition, the thickness of the underlying pad material of the mounting base may be increased/decreased to meet the positioning requirements of different liquid levels. The 3.5mm copper cable of diameter (internal diameter of copper wire up to 2mm) is used to ensure normal operation even if the gr and maximum current up to 30 A passes.