SensorFS177LF-B is a magnetic sensor manufactured by Feeling Sensor. It is a TO-92SP-3 package, with RoHS compliance. It uses reed-switch technology for switching functions in presence of magnetic fields, and can detect both N and S poles of the field. It is capable of operating from -40°C to +85°C and has a maximum rating current of 20mA. The sensor can be used for applications such as current sensing, motor speed control, rotation sensing, security protection, and proximity sensing.