The packages on offer change from time to time, so you’ll have to check SimpliSafe’s website for current equipment options. But you’ll save roughly 20% over what you’d pay for a brand new system, and SimpliSafe regularly runs deals on its refurbished equipment as well, so you can save even more. As long as the person has discontinued their monitoring plan, you can set the system up as your own using the serial number on the base station. The previous owner will not have access to your system, as it will be hooked onto your Wi-Fi network and will be controlled by your custom PIN, not theirs.