The present invention relates to a wireless data communication module (100) for a drug injection device. The wireless data communication module (100) comprises a folded flexible carrier member (107) comprising a plurality of stacked component support regions (203, 205, 207, 209, 211) and a display (103), such as a LCD or OLED display, electrically connected to a first component support region (203) of the folded flexible carrier member (107) via a first set of electrical connection terminals. The display (103) comprises an outwardly facing readable display and an opposing, downwardly facing, optical reflector (319). The wireless data communication module (100) additionally comprises a NFC antenna (105) attached to a second component support region (205) of the folded flexible carrier member (107) situated below the first component mounting region (203). The optical reflector (319) of the display comprises an optically reflective and non-magnetically permeable material.
