The "poor man's" accelerometer/motion sensor! These spring-vibration switches are medium sensitivity non-directional vibration induced trigger switches. Inside is a medium hardness 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 stiffer spring, which is harder to trigger, and a version with a very soft spring, which is easier to trigger!   

Technical Details   
    •    Maximum Operating Temperature: 260°C ± 10°C   
    •    Contact Time: 2 - 2.5ms   
Dimensions:   
    •    Diameter: 5mm / 0.2"   
    •    Height (w/ pins): 23mm / 0.9"   
    •    Height (w/o pins): 11mm / 0.4"   
    •    Weight: 0.2g