Philips RL191 FM Radio Switch this radio on and off via the power control. You can also adjust the volume, select the band of your choice and tune through the respective controls. This radio utilizes frequency modulation (FM) and amplitude modulation (AM) to receive radio waves that are transmitted from radio stations. This device functions within the 520 to 1650 kHz frequency range when it comes to AM and 88 to 108 kHz range with respect to FM.