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Ring makes, among other products, a wireless, video doorbell that connects to your smartphone so that you can remotely see and speak real-time to the person at the door through your mobile device - even if you are not actually home.
The idea was largely based on the idea that a burglar tends to ring the bell before breaking in. With Ring, you could see who is at the door and even pretend you're at home when you're not, making it a convenient home-security device