Using this app, you can create awesome green screen videos. PowerDirector also comes with tutorial videos for all of its functions. Most of its features are available in the free version, but upgrading to the full version allows you to remove watermark, ads, and even to extract videos in 1080 and 4K resolutions. It is supported in Android 4.3 and above.
Other features to look for include face recognition technology that identifies visitors by name, motion sensing technology that knows the difference between people, cars, and animals, color night vision video (most doorbell cameras use infrared LEDs to provide up to 30 feet of black-and-white video), and a choice of chimes that will help you differentiate between a doorbell press and a motion trigger. Some of latest doorbell cameras offer a pre-buffer feature that records several seconds of activity prior to when a motion sensor is triggered or the doorbell button has been pressed so you can see what happened just before an event.
Imo is a simple video calling and chatting app. It boasts compatibility for 2G, 3G, 4G, and LTE networks. That makes it good for those stuck on worse connections. It's also compatible with both iOS and Android. Otherwise, there isn't much to this one. That's not necessarily a bad thing. Aside from text chatting and video calling, this app doesn't have any bloat holding you back from a simple experience. It's free to download and use. The only thing you'll need to deal with is some advertising.
Wired doorbells draw power from two wires that are connected to a transformer that steps down your household power to between 16 to 24 volts. If your home is not equipped with doorbell wiring you can wire it yourself using a plug-in transformer, or have an electrician do the work for you. Either way, some drilling will be required to run wires from the inside of your home to an exterior location.
I test each service's prominent features, but it's up to you to decide whether or not you need dial-in numbers, VoIP, or both options for your audio, and whether or not you need video calls in addition to screen sharing. Some services offer both teleconferencing with dial-in numbers (local or toll-free) and VoIP calling, while some offer just one or the other. A few offer international dial-in numbers. Adobe Connect doesn't offer teleconferencing at all but can be integrated with a number of other services. Most offer video calls via webcam, although a few don't.