The Lectrosonics UM400 Belt Pack Transmitter is a professional-grade, rugged wireless microphone transmitter renowned for its exceptional audio quality, robust RF performance, and legendary reliability in broadcast, film, and theater production. Operating in the UHF frequency band, it offers user-selectable frequencies across a wide tuning range, allowing for easy coordination within crowded wireless spectrums to find clear, interference-free channels. The UM400 is built to the highest durability standards, featuring a machined aluminum case that protects its sophisticated electronics from physical impact and electromagnetic interference, ensuring consistent performance in the most demanding environments, from desert heat to rainy outdoor shoots.

Audio performance is a hallmark of the UM400. It accepts a wide range of input levels and features Lectrosonics' proprietary companding technology, which delivers a very wide dynamic range and low noise, preserving the subtle nuances of the source material. It can be powered by a single 9-volt battery or an optional rechargeable battery pack, offering long operational life. The transmitter includes comprehensive controls and status indicators, along with support for Lectrosonics' SmartTune and frequency scanning features when used with compatible receivers, simplifying setup and ensuring optimal RF link quality.

The UM400 is designed for professional users who cannot afford dropouts or compromised audio. Its compatibility with a vast array of lavalier, headset, and handheld microphones via various connector options (such as TA5F) makes it a versatile core component of any high-end wireless system. Whether used for transmitting a lavalier microphone on a news anchor, a headset on a Broadway performer, or a shotgun mic on a film set, the UM400 provides the rock-solid RF stability and transparent audio quality that audio professionals depend on for critical applications.