What low-power wireless standard is commonly used to connect a phone to headphones or a smartwatch?

Fact

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Bluetooth is a family of radio standards designed to connect devices over short distances in a personal network. For example, it allows you to connect a phone to headphones, a watch, a keyboard, a controller or sensors. Bluetooth Low Energy is particularly suitable for objects requiring low consumption. The technology uses the 2.4 GHz frequency band and provides pairing and security mechanisms. Wi-Fi, NFC and infrared also allow short-range wireless communications, but with different ranges, speeds and uses; the example of headphones therefore makes Bluetooth identifiable.