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Cheapest (~10-15USD/unit) Wireless Intercom or Simple USB Powered Walkie Talkie Hack : 3 Steps - Instructables

Nexelec - RISE 3-in-1 room sensor

9 inch WIFI Video Door Phone Intercom Entry System 1 Monitor + 1 RFID Outdoor Camera + Electric Lock APP Phone Unlock - AliExpress

Sonnox - Audio Media

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Dragonsview 1080P Wifi Wireless Door Intercom Video Phone Doorbell Camera 2 Monitors 7 Inch Call Transfer Tuya Smart Mobile App - AliExpress

Audio & Video -Datavideo 2011 by Telvicom - Issuu

Smart Wi-Fi floodlight camera - NHC-F610

ProX XZF-AH-SQ5 For Allen and Heath SQ 5 Flip-Ready Hydraulic Console

GBF Smart Video Door Phone & Doorbell Smart Intercom System with a smart keypad (PL963PMPOE)- 1080P camera, Built in POE, Control two locks remotely, Timed Unlock : Electronics

General Electronic Services Ltd. (GES)

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