The Bosch ISN-SM-50 is a seismic detector with a 4m operating radius on concrete. The unit monitors objects and surfaces, has a low-profile design, and can be installed effortlessly, even in tight spaces. The detectors is designed to monitor safes, night safes, and automatic teller machines. Also known as -ISN-SM-50 Motion Sensor-Bosch - ISN-SM-50 - Bosch ISN-SM-50 Motion Sensor