When choosing a smart doorbell you have to decide if you want a wireless device that runs on batteries or one that gets its power from low-voltage doorbell wiring. Naturally, a wireless doorbell is the easiest type to install, as it draws power from batteries rather than from your home's electric and doesn't require that you turn off power or mess with any wiring whatsoever. The downside to wireless doorbells is that their batteries tend to deplete batteries quickly depending on usage, lasting anywhere from two to six months. If you live in an area where the winters are cold you can expect to recharge or replace your batteries every couple of months, and run the risk of your doorbell shutting down at an inopportune time.
Signal Private Messenger is one of the most popular privacy chat apps. It features end-to-end encryption for all messages, voice calls, and video chats between two Signal users. It focuses a lot on individual chats. There are group chat features, but it's mostly for personal use. This is one of the biggest differences between it and rival privacy chat app Telegram. Video calls worked fine in our testing so we have no trouble recommending them. It's a neat way to get some encrypted chats as well. The app is also completely free and open source. You can't really go wrong with it, but there are better video chat apps if you need group video chats.