Smart absorbent article and components

A substrate (1) suitable for incorporation into an absorbent article (100) for automatic detection of wetness events therein and/or risk of exudate leakage therefrom, the substrate comprising a first surface (2) capable of being arranged proximal to a body facing side of the absorbent article (100) and a second surface (3) opposite said first surface (2) and capable of being arranged proximal to a garment facing side of said absorbent article (100), said substrate (1) comprising a plurality of sensor tracks (101) disposed on said first surface (2) wherein said sensor tracks (101) are in electrical communication with a clip-on data processing module (103) when connected at a position proximal to a first end (5) of the substrate (1) such to form a closed electrical circuit, characterised in that said substrate (1) comprises one or more slits (15) and an insulating layer (200) placed over said first surface (2) to sandwich at least a portion of said sensor tracks (101) therebetween, and in that a pocket (16) is formed between said first surface (2) and said insulating layer (200) at least proximal to said first end (5), said pocket (16) being in fluid communication with said slit(s) (15) and arranged to retain at least a portion of said clip-on data processing module (103) therein.