The \”poor man\’s\” accelerometer/motion sensor! These spring-vibration switches are high sensitivity non-directional vibration induced trigger switches. Inside is a very soft spring coiled around a long metal pin. When the switch is moved, the spring touches the center pole to make contact. So, when there\’s motion, the two pins will act like a closed switch. When everything is still, the switch is open. Great for basic projects and wearables! We also have a version with a slightly stiffer spring which makes it harder to trigger, and a version with a much more stiff spring which is even harder to trigger! Technical details Electrical characteristics: Maximum Voltage: 12V Contact Resistance: <10 ohm Contact Time: 2 ms Maximum Current: 20mA Insulation Resistance: >10M ohm Temperature Range: -40 to 80C Operating lifespan: 100,000 cycles Diameter: 5mm/0.2\” Height (w/ pins): 25mm/1\” Height (w/o pins): 15mm/0.6\” Weight: 0.3g