A wrist computer to be worn on an arm of a user, comprising a detection device configured to detect at least one vital parameter of the user, and a radio module configured to, when activated, establish and maintain a wireless data connection to a radio module of another object, wherein the wrist computer comprises a control unit configured to activate the radio module of the wrist computer when the at least one vital parameter of the user is detected by the detection device, and to deactivate the radio module of the wrist computer when the at least one vital parameter of the user is no longer detected by the detection device.
