The Zizmos warning system relies on mobile technology and a sensor with a MEMS accelerometer, which detects vibrations. After it’s installed in a home or building, the sensor connects to that building’s Wi-Fi and starts recording the ground shaking. It sends this data to the Zizmos cloud server, which uses an earthquake detection algorithm to determine if the shaking was a quake — or a car accident outside. If it is an earthquake, it determines the location and origin time.