Audio-Technica ATW-T901a System 9 Bodypack Transmitter

The ATW-T901a is the body-pack transmitter from Audio-Technica's System 9 VHF wireless line, sold on its own for a production adding a channel or replacing a damaged unit rather than buying a full receiver-and-transmitter system. It runs on the same VHF highband frequencies (169.505-171.905 MHz) as the rest of the System 9 line and pairs with the ATW-R900a receiver to complete a channel.

Like the rest of the System 9 family, it takes a four-pin locking UniPak-style connector for lavalier, headworn, or instrument cables, and runs on two 1.5V AA batteries for roughly 8 hours of use.