Refrigerant fluid such as CO2, compressed to the supercritical pressure by a compressor, is delivered selectively through a three-way valve, either into a branch of the circuit containing a cooler, an expansion device and an evaporator for cooling the cabin of a vehicle, or into a branch containing another expansion device and a heat exchanger for the purpose of heating the cabin. The material is to remove a preponderance of the manure. A simulator simulates whether each of the second patterns is practical while referring to the parts specification information. The coupling circuit is configured to operate in a first state to couple the capacitor between the first and second nodes in a first orientation and operate in a second state to couple the capacitor between the first and second nodes in a second orientation that is opposite to the first orientation. The resulting variable switching frequencies also help to alleviate EMI problems. The tether line enables the hand-held styling comb to be secured to the wrist band for easy access by the user.