Honeywell International Inc. is a publicly traded conglomerate headquartered in Charlotte, North Carolina that produces commercial and consumer products, engineering services and aerospace systems.

DoorBird stands for the combination of exclusive design with the most innovative IP technology in the field of door communication. Doorbird products are made from corrosion-resistant precious metals and manufactured in Germany according to the highest quality standards. The design is pure, straightforward and smooth.

Google Nest is a brand of Google LLC used to market smart home products including smart speakers, smart displays, streaming devices, thermostats, smoke detectors, and security systems including smart doorbells, cameras and smart locks.