Does your Keypad look like the one pictured to the left? Then you're in the right place! You've got the Gen 3 SimpliSafe system. If you purchased a system in 2017 or earlier, you have the Original SimpliSafe. Click here to view the article about the Original SimpliSafe. If you're not certain which system you have, you can tell the difference here.
You do not need a computer or WIFI for SimpliSafe to work for your basic home security needs. However, WIFI and access to the SimpliSafe app through either Google Play Store or the App Store for iOS users is required for the SimpliCam or Video Doorbell Pro.