This vibration sensor module of Linker Kit uses a spring based sensor. When there is vibration, it will output a digital signal. The SW-18010P series spring type used is a non-directional trigger switch. Switch is open circuit OFF-state when it is static, and when external force results in a corresponding vibration, or movement speed gathers enough centrifugal force, conductive pick feet will produce instant conductivity and circuit goes to On-state.