Keep an eye on your windows and doors from anywhere with the Sensative Z-Wave Plus Strips Invisible Window Sensor. Exceptionally thin, this superbly compact sensor measures just 0.15 inches thick. That’s the same as two credit cards stacked on top of each other. But, don’t let its small size fool you. The Sensative Z-Wave Plus Strips use magnetic technology to instantly detect whenever a window or door opens. As soon as the magnets become misaligned, you’ll get an instant notification on your device. Likewise, because it’s on the Z-Wave network, you can also pair it with the hub for home automation. For example, the sensor can detect an open window and automatically turn off your smart thermostat. You can also have a connected siren that goes off if a door opens when the system is armed. With a 10-year battery life, you can truly set up this sensor and forget it.