Headphone and interaction system

An interaction system, comprising a smart terminal and a headphone;

• wherein processing of audio and video data and detection of biological features by a biological features detection module in the headphone are triggered by connecting a Type-C interface in the headphone to the smart terminal, the headphone comprising:
• the Type-C interface;
• a controller electrically connected to the Type-C interface;
• the biological features detection module connected to the controller;
• a microphone electrically connected to the controller, and
• a loudspeaker electrically connected to the controller;
• wherein the biological features detection module is configured to detect biological features of a user wearing the headphone;
• the controller is configured to control, when the headphone is in a digital mode, paring between the Type-C interface and a terminal and communication among the terminal, the biological features detection module, the microphone and the loudspeaker, to control detection of biological features and processing of audio and video data.