The MS-EX-F7-1 is a Amplifier Built-in Leak Detection Sensor with 2m cable length type. NPN open-collector transistor. Sensing object EX-F71-PN-C5 EX-F72-PN EX-F72-PN-C5 Sensing object Water, Fluorinert. Ambient temperature is –10 to +60°C. It has Red LED (lights up when leak is detected or the sensor is mounted improperly) and Green LED (lights up when the sensor is mounted properly.)