【TWO DETECTION PROBES】This is a infrared dual-level water sensor module with two detection probes. 【FULL-SEALED&WATER PROOF】Sensor probes adopt full-sealed waterproof design. 【RELAY SWITCH OUTPUT】Output mode is relay switch output, withstand current is 30A. 【WELL FUNCTION】When liquid level state indicators (D3, D4) light on at the same time, relay status indicator (D1) lights on and relay start to work. NO and COM are connected and external load starts to work. When D3, D4 light off at the same time, D1 lights off and rel. 【WIDE APPLICATION】Used in laboratory, automatic water filling system of fish tank and other situations requiring water level control and protection, as well as general industrial site water level control., Weight: 0.220462262 pounds, Manufacturer: Hilitand