According to an example embodiment, there is provided a method in a device including a sensor portion for deriving, on basis of one or more sensor signals that are descriptive of respective characteristics of a body of a living subject, at least a first biometric signal that is descriptive of a first biometric characteristic of said subject, the method including detecting presence of another device that is capable of providing, over a wireless link, information carried in a second biometric signal that is descriptive of a second biometric characteristic of the same subject, receiving, from the detected device via the wireless link, one or more values of the second biometric characteristic carried in said second biometric signal and selectively enabling or disabling derivation of said first biometric signal in dependence of said one or more values of the second biometric characteristic received from said detected device.