Apparatuses and methods of power save for wireless access point and multi-hop relays are disclosed. The composition to be polymerized by the free radical polymerization mechanism is irradiated by a substantially constant radiation, the radiation being substantially without pulsation. The system further includes a summation component configured to add a first error voltage value, which is derived from an output signal, to an incoming input signal, and a subtraction component configured to subtract a second error voltage value, where the second error voltage value is derived from the adding of a first error voltage value to an incoming input signal. The mobile radio terminal sends measured information including the reception status and the position to an information collecting server. However, the compressor continues to run and cool the evaporator for a predetermined period of time to a desired lower temperature.