Recently I did a clean out of a house, and the owner said take everything. I found a NIB Williams Sound PPA T4 Personal FM transmitter among hundreds of other items. Just wondering if anyone has an information as to the value of this. I'm assuming, like any FM transmitter, it just spits out the inputted audio on a set frequency that people can tune into. I assume for hearing impaired, or can be hooked to a PA. I haven't really taken it out of the box to examine it, aside from cutting the tape, and peaking inside. I've attached a photo of the side of the box. Any information is appreciated. Thanks.