Communication nodes for use with a wireless ad-hoc communication network are disclosed. This arrangement provides the air conditioner with less electromagnetic wave noise of the switching power supply, with a quick check and repair, and with having a motor-driven compressor quick start. The device also includes a collar coupled to the distal assembly proximate to the distal assembly. The slidable grip is slidable longitudinally with respect to the shaft so that the right hand moves progressively down the shaft during the backswing and then progressively back into proximity with the left hand during the downswing. In an alternative, a single layer tunneling layer is used. In the strike stratum, the volume ratio of the low-density ceramic material to the elastomeric matrix material is in the approximate range 4-20.