7. This WiFi video doorbell is an easy to install system that you can connect to your existing doorbell, allowing you to easily communicate with the person at your door. It’s one of those DIY installations that don’t require a lot of effort to set up, saving you the trouble of hiring a professional to install it in your home. It has an impressive 720p HD video resolution, as well as great night vision that lets you see things clearly even in complete darkness. With the YYGIFT Smart Video WiFi Doorbell’s motion sensor technology, you’ll receive alerts on your phone whenever someone rings the doorbell. You can also easily adjust the sensitivity so you won’t be troubled with false alarms.