You can easily add new sensors to an existing SimpliSafe system. In fact, the process can be done using a phone or the SimpliSafe Keypad. Here's how it works.

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I've been living with SimpliSafe's security system for six months, which includes a security camera, entry sensors, motion sensors, a smoke detector, and a carbon monoxide detector.

The 6-piece SimpliSafe security system ups the number of entry sensors to three and swaps out the key fob and motion sensor for a 1080p outdoor security camera.

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SimpliSafe 8 Piece Wireless Home Security System (Deal Price: $143 ) includes a Base Station, 1 Keypad, 4 Entry Sensors, 1 Motion Sensor, and 1 Panic Button.