Panasonic WX-TB831 This is the main unit and accessories of the 2-piece wireless microphone released by Panasonic RAMSA. I am selling this item, which I was using until about a year ago. It was working without any problems until about a year ago. Currently, I do not have a wireless device receiver, so I cannot confirm its operation. Therefore, I am selling it as a junk item. The original box and bags are not included. Please understand that this is a used item and is non-refundable and non-returnable. The following is a description of the product. Frequency band: 800 MHz band (Type B) wireless system, allowing you to select and use any one of 30 frequencies from 806.125 MHz to 809.750 MHz. Type: 2-piece type (belt pack transmitter) for concealed use, with a φ6mm omnidirectional dedicated lavalier microphone (pin microphone) included. Sound quality: The sound is characterized by low distortion up to high frequencies and clear sound. Compatibility: Designed primarily for use with the 800 MHz band wireless receiver WX-R822 (sold separately), but also compatible with other Panasonic 800 MHz band ENG/EFP wireless receivers (WX-RJ800A, WX-RJ700A, WX-RM770A, etc.). Power supply: 2 x AA batteries Accessories: In addition to the belt pack body, a lavalier microphone, a pin microphone clip, two windscreens (one is new), and an external microphone conversion cable are included. Notes Compatibility: Wireless systems may not be compatible between manufacturers, even if they use the same frequency channel. Be sure to use it in combination with a receiver from the same manufacturer. Discontinued product: The WX-TB831 is currently discontinued, and it is difficult to obtain it new, with the focus being on the used market and rentals. For detailed operating instructions and settings for the product, you can refer to the instruction manual (PDF) published on the Panasonic official website.