Abstract: A self-contained illumination device (10) for attachment to a container, e.g. to the base of a bottle, comprises a printed circuit board (12), with LEDs (14) attached to the central region of a liquid-impervious flexible pad (11). The central region is surrounded by an annular adhesive region which is arranged to attach the pad to the container in liquid-tight manner. The pad comprises a base layer (32) of plasticized paper or PVC, covered by an adhesive layer (34) and, before attachment to the container, a peripheral layer (36) of a release paper.