M9 Wireless Video Doorbell Night Vision Two-way Intercom 2.4G
WiFiPhone Remote Visual Door Bell 50M Penetration

WiFi - A term used for wireless networking

Radio - A device used for listening to audio transmissions

phone - Short for telephone. A device that transmits sound allowing point to point communication over long distances

Wireless - A wire free device that uses radio and microwaves to send signals.

Vision - To be able to imagine, also can mean what you can see.

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