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Unlike universal or realtor residential-grade boxes that can be opened by anyone who has a common key or PIN, Knox HomeBox is a high security, weather-resistant key safe that can only be accessed by your fire department 24 hours a day, 7 days a week to provide peace of mind and safety to your property, loved ones, and pets.
A black box is any device whose workings are not understood by or accessible to its user. According to Edward Tenner, writing in The Washington Post, the first black box was a gun sight carried on World War II Flying Fortresses, with hidden components that corrected for environmental variables, such as wind speed.