To make the output signal more reliable and neat, we added a neccessary exterior circuit to reduce the noise impact. So, normal shaking will not cause any output. The sensor has a high sensitivity, then you can use it to apply to your project,such as automatic wake-up and power-down for battery management.
Its working voltage is 5v which make it compatile with standard Arduino/Seeeduino 5V system.
Please visit the wiki page for more info about this product.