A two-wire lighting control device, may include a controllably conductive device, a signal generation circuit, and a filter circuit. A subtree typically includes one or more leaf arrays and multiple tree arrays. The terminal 50 sets the delivered WEP key in itself. The processed friction material substrate is cut into segment pieces each having a segment shape by a rotary push cutter having a sharp cutting edge. The gooseneck may include a microphone clip which releasably secures a microphone. When a projection timing for a red image arrives while an image is projected, an MPU receives a light of an image projected on the screen at that time to acquire image information, and detects a position pointed by the laser beam based on the acquired image information.