The Sony WRT-822B is a professional UHF wireless bodypack transmitter designed for use with Sony's compatible wireless microphone systems, such as the UWP-D series. This compact and rugged transmitter is engineered to provide reliable, high-quality audio transmission for lavalier microphones, headset mics, or instrument pickups in demanding environments like broadcast television, live theater, corporate presentations, and film production. Operating in the UHF band, it offers superior frequency agility and resistance to interference compared to VHF systems, with a synthesised tuner that allows users to select from a wide range of frequencies within its operating band to avoid crowded RF spectrum and find a clear channel. The bodypack is typically clipped to a user's belt or concealed under clothing, transmitting the microphone's signal to a paired Sony receiver.

The transmitter is built for durability and ease of use, featuring a robust metal chassis, clear status indicators, and simple, secure controls. Key functions include power on/off, frequency selection, and adjustable audio gain to optimize the input level from the connected microphone and prevent distortion. It supports both microphone and line-level inputs via a 3.5mm locking connector, providing flexibility for different types of sources. The WRT-822B is powered by a single AA battery, offering extended operating time, and includes battery level indicators to alert the user before power depletion. Advanced features often include a tone squelch system to reject stray RF signals and optional external antenna connections for challenging RF environments when used with specific accessories.

For audio professionals, the Sony WRT-822B represents a reliable and versatile component of a wireless microphone system. Its robust construction ensures it can withstand the physical demands of daily use, while its stable RF performance provides confidence that critical audio will be delivered without dropouts. When paired with a high-quality lavalier like Sony's ECM series, it forms a discreet and powerful tool for capturing clear dialogue and vocals, making it a staple in broadcast kits and professional AV installations where wireless freedom and audio integrity are non-negotiable.