Ⅰ. Features: Ⅱ. Made of fireproof ABS material, durable, firm and has a long service life. Ⅲ. It can automatically turn on or off the power supply of all electric devices according to the water level the users set. Ⅳ. Fast induction, high sensitivity, quick control the water level in time. Ⅴ. Well protect the water pump, extend the lifetime, let it work efficiently. Ⅵ. Auto water replenishment and drainage, easy to install according to the manual. Ⅶ. Indicator light design, red light for the power, green light for output. Ⅷ. Two patterns optional: with switch or without switch, easy to operate and use. Ⅸ. Suitable for sewage disposal, home water pump, pump, water tower, pool, production equipment, etc. Ⅹ. Specifications: Ⅺ. Item Type: Automatic Water Level Controller Ⅻ. Material: ABS ⅩⅢ. Size: 92x66x49mm/3.6x2.5x1.9in ⅩⅣ. Color: Grey ⅩⅤ. Optional Type: A, B, C, D ⅩⅥ. Control Distance: less than 50 meters ⅩⅦ. Rated Current: 30A ⅩⅧ. Rated Voltage: 220V ⅩⅨ. Quantity: 1 PC ⅩⅩ. Note: ⅩⅪ. Transition: 1cm=10mm=0.39inch ⅩⅫ. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. ⅩⅩⅢ. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you ⅩⅩⅣ. Package Includes: ⅩⅩⅤ. Type A: 1 x Automatic Water Level Controller ⅩⅩⅥ. Type B: 1 x Automatic Water Level Controller ⅩⅩⅦ. 3 x 2m Sensor ⅩⅩⅧ. Type C: 1 x Automatic Water Level Controller with switch ⅩⅩⅨ. Type D: 1 x Automatic Water Level Controller with switch ⅩⅩⅩ. 3 x 2m Sensor