Many home security systems offer video doorbells as add on components, but these devices typically do not work on their own and must be connected to a system hub. However, they usually interact with other system components such as door locks, sirens, and lighting. If you want a standalone smart doorbell that will work with other smart devices in your home, look for one that supports the IFTTT If This Then That internet service. With IFTTT you can easily create mini programs, called applets, that let IFTTT enabled devices interact with each other. For example, you can create an applet that tells a Wemo Smart Switch to turn on when a Ring Doorbell is pressed, or have a D Link siren sound when an August Doorbell Cam senses motion. Best Video Doorbell Reviews Featured in This Roundup:August Doorbell Cam Pro ReviewMSRP: $199. 00 at Pros: Excellent HD video quality. Clear two way audio. Works with other August devices. Hindsight pre buffering. On demand video streaming.