Meet the WOHOME BA02 Doorbell Camera: a smart gadget that lets you remotely view and speak to your visitors from your smartphone or tablet. It has a motion sensor that alerts you when a visitor does not press the button. The device offers support for up to 64GB TF cards.
This video doorbell offers 720p video resolution and encryption. It is made of ABS plastic. You can get it for under $80 at this time.