... of the sound sensitivity control system is only 2 milliseconds. AM/FM radio earphone Protector with Digital Tuning.AMPLIFICATION: This ... stereophonic, with maintained directional sound.Receiver/Input capabilities for: Computer, AM/FM Radio, CD, DVD, MP3 Player, TV or other electronics ... sound.FM radio frequencies jump in multiples of 10 kHz; AM radio frequencies jump in increments of 9 kHz, from ...