Abstract: The wearable assembly (100) comprises an electronics module (4). The electronics module comprises a controller arranged to interface with sensing components (2, 3) so as to sense activity data associated with a user wearing the electronics module. The electronics module has an arrangement of coloured LEDs which can also flash in a predetermined sequence and form a machine-readable code on the external housing of the electronics module which acts as an electronics module identifier. The LED arrangement also acts as an augmented reality marker and enables a wearer of the electronics module to be identified at a distance and activity data and other information displayed in an augmented reality display on a user electronic device such as a mobile phone (400).