A timer kit comprises a battery powered timer and a caddy assembly. The battery powered timer has a colored disk attached to a rotatable shaft. The initial position of the colored disk is manually set by an operator using a positioner accessible through a circular opening extending through a front wall of the caddy assembly. The battery powered timer is removable from the caddy assembly in a generally vertical direction behind the front wall of the caddy assembly. The caddy assembly has a receptable for holding the battery powered timer in a generally vertical orientation behind the front wall of the caddy assembly.

A case including a device case, and an exterior member which is attached covering an outer circumferential surface of an upper part of the device case, in which the device case has a catching portion formed in an outer circumferential portion thereof, the exterior member has an engaging portion which is formed on an inner side portion thereof, engages with the catching portion when the exterior member is attached to the device case, and prevents the exterior member from being detached from the device case, and a support area which supports the engaging portion of the exterior member is formed of a material whose hardness is lower than hardness of a material of an area adjacent to the support area.