The present invention is related to a watch case adapted to be integrated into a wrist watch device, the watch case comprising an inner volume for housing internal components of the wrist watch device and attachment elements for attaching at least one watch strap of the wrist watch device, wherein at least one portion of the inner volume of the watch case extends laterally (or longitudinally) beyond the points of attachment of the at least one watch strap. The present invention is also directed to a corresponding watch strap as well as to a wrist watch device comprising such a watch case.

A detection device including a device main body provided with a light receiving hole corresponding to a light receiving element and a light emitting hole corresponding to a light emitting element, and a waterproof member arranged between an outer circumferential surface of a cover arranged in the light receiving hole or the light emitting hole and an inner circumferential surface of the light receiving hole or the light emitting hole.