Movement-Sensors-Comus-VBS030100-Vertical-Movement-Sensor-Vibration-Type-25 Vdc-Switching-Voltage-25m A-Switching-Current-NC-Contacts-25-C-to-70-C-Wire-Lead-Connection-Zinc-Alloy-Housing-Switches-with-Two-Contact-Balls-for-Extra-Sensitivity-to-Detect-Vibration-Both-Ideal-for-Anti-tamper-Detection-in-Security-Systems-Operates-in-All-Positions-Although-Sensitivity-may-Vary-Circuit-is-Normally-Closed-but-Switches-Should-be-Used-in-a-Change-of-State-Mode Movement-Switch-Vertical