SONY Wireless Transmitter B Band 800MHz WRT-820 This is a SONY 800MHz B-band wireless transmitter. I have used it for about two years, but the previous owner's usage frequency is unknown as it is a used item. There were no problems such as noise, sound dropouts, or poor sensitivity during operation. * Serial number is in the 107000 range. Included items: Main unit only [Notice] This product is used. I checked the parts that are likely to be used during normal use when listing, but I haven't checked the very fine details. Also, I cannot guarantee the condition upon arrival. Please check it as a reference only. Please refrain from purchasing if you are looking for a perfect product. * The equipment used in the operational image is a reference example. Items other than those listed as accessories are not included. * As this is a used item, there may be scratches, dirt, and dust. We have performed a simple cleaning, but please understand this beforehand.