Zmodo provides two way communication between your visitor at the door and yourself with your smart phone app – you can see, listen to, and speak with whoever is at your door. Zmodo Greet also offers smart motion detection that, when triggered by motion, will send a real time alert your smart phone and begin recording video. These short clips are stored for free in the cloud and are accessible for 36 hours. What’s more, if you are unable to answer the door, you can pre program a voice message for Zmodo to play for your visitor. The Zmodo Greet Smart is installed with your existing doorbell’s wiring, and then adds the Zmodo Beam included in this package to serve as a smart hub of sorts and as dual wi fi extender. The Zmodo Greet camera is 720p resolution and will store 8GB of video footage internally with an option for subscription based cloud backup service. You also have access to live feed anytime you want it via your smart phone or online. Infrared night vision allows you flexibility and security in identifying who is at your door whether during the day or at night, as the camera can switch to black and white night vision view in the dark based upon your customized sensitivity adjustments. The iseeBell Wi Fi Enabled HD Video Doorbell provides wi fi connection 2. 4GHz in a simple installation. This video doorbell design is powerful and compact, at just 3.