Wireless system with sound quality adjustment function. Junk item. - Brand: audio-technica - Model: ATW-T102/R100 - Functions: Microphone level adjustment, battery indicator - Antenna: 2 antennas - Channel settings: B-band, 30-wave selectable - Included items: 2 whip antennas (BNC connectors), receiver mounting brackets (2, aftermarket) Thank you for viewing. I checked this after a long time (5 years), and although both units power on, they are no longer receiving. It is unknown whether the transmitter (ATW-T102) or the receiver (ATW-R100) is faulty, but neither the A nor B LED of the diversity function is lit, so I believe no sound will be produced. Originally, this was used to make a wired dynamic microphone wireless as shown in the first photo. However, I used it by attaching the transmitter to the mixer's send and the receiver to a powered speaker in a distant location. (It was useful in temporary setups for weddings, where it was difficult to run cables, such as when trying to get the sound from an indoor chapel to an outdoor garden, with doors or overlapping guest pathways.) Please consider this a junk item, assuming it needs repair or is for parts. Please note that the handheld microphone in the first photo is not included in the sale.