A pen has a marking device operative to mark a visible path onto a surface. The relationship between ambient light level and the surround illumination is an inverse power function. After the patch is adhered and then stripped off, no fiber piece remains on the pressure-sensitive adhesive face of the backing layer so that the adhesive force of the patch can be sustained in the case of re-adhesion. The COT102 event exhibits a novel genotype comprising two expression cassettes.