Works with Alexa for voice control (Alexa device sold separately).See, hear and speak to anyone at your door from your smartphone, tablet or PCGet instant alerts when visitors press your Doorbell or trigger the built-in motion sensorsWatch over your home in crystal-clear HD videoLive View enabled: Check-in on your property at any time with video on demandLifetime purchase protection: If your doorbell gets stolen, we'll replace it, for free!