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People Power's Presence Security Pack costs $299 (£190 in the UK and AU$405 in Australia at the current exchange rate).
This kit comes with an assortment of sensors, including three door/window sensors and one each of motion, temperature, touch/tamper and water sensors.
The whole system is ZigBee-enabled.
The Gateway hub bridges communication between the Presence devices, your local Wi-Fi network and your mobile or Web app.
Just use the included Ethernet cable and power adapter to connect the Gateway and download the free Presence app to get started.
Stick the water sensor in a leak-prone area.
The motion sensor works as an extension of the app, tracking any activity that crosses its path.
You can either set the motion
sensor on a flat surface for a fast install or use the included hardware for a
more permanent setup.
These contact sensors are designed
to alert you when someone opens a door or a window.
You'll also get temperature and touch/tamper sensors with this kit.