Various aspects relate to a method. The ball-shaped or substantial ball-shaped capsule, in one embodiment, having a head and a tail is able to store and deliver colored markers upon an impact between the projectile and an object. A clamp protrusion is formed on an inner surface of the clamp portion and clamps the cable exposed from the end portion by pressing the cable in a radial direction. The reinforcing bracket is coupled to the at least one keeper arm and to the housing to hold the at least one keeper arm in a plane perpendicular to the plane of the housing. The cover plate is disposed over the substrate and is connected thereto via the sealant, such that the organic electroluminescent device can be covered thereby. When the presence of a person is detected by the human body detector, a person detection signal is sent to a wireless video reception device or the transmission device to thereby limit usable communication channel candidates in number.