Tilt sensorsTilt sensors allow you to detect orientation or inclination. They are small, inexpensive, low-power and easy-to-use. If used properly, they will not wear out. Their simplicity makes them popular for toys, gadgets and appliances. Sometimes they are referred to as "mercury switches", "tilt switches" or "rolling ball sensors" for obvious reasons.PCB board size: 16*14mmLocation hole diameter: 3.1mmFree 2pcs 20cm cableWorking Voltage: 3.3-12V