The TRX900AA is an encrypted digital wireless transmitter with optional internal backup recording and IFB. It uses an unbalanced microphone input via a 3-pin micro-LEMO connector. You can use an unbalanced dynamic microphone or a powered lavalier microphone.

It is also capable of stereo transmission when used with the STA-100 Stereo Adapter, which provides 3.5mm output for IFB or timecode, and a 3.5mm timecode input.

Powered via 2x AA batteries or an external 12VDC via the STA-100 Stereo Adapter.

This transmitter is paired with the RX900 Receiver.