Bb sensors pir motion alarm modules fresnel lens or mirror optic bb sensors pir asic spie this pir motion alarm module employs asic technology and is designed with sensors that are tuned to the heat output from moving bodies and upon detection will generate a high power relay output the module has three potentiometers to adjust sensitivity time delay and light dependent switching point a digital evaluation filter in the asic circuitry make the module ideal for where a high level of act