The DBu transmitter is a 4th generation design with specially developed, high-efficiency digital circuitry for extended operating time on two AA batteries. The transmitter can tune in coarse or fine steps across the UHF television band from 470 to 608MHz (470-614MHz for export versions), with a selectable output power of 25 or 50mW. The pure digital architecture enables AES 256-CTR encryption for high-level security applications.

The top panel contains the antenna jack, audio input level LEDs, the programmable function switch and the audio input jack. The LEDs provide red/green indications of the audio level from -20dB to the onset of limiting to enable accurate input gain adjustment. The programmable switch can be configured as a mute switch, a power on/off switch, talkback, or be bypassed.

Studio quality audio performance is assured by high quality components in the preamp, wide range input gain adjustment and DSP-controlled limiting. Input connections and settings are included for any lavaliere microphone, dynamic microphones and line level inputs. Input gain is adjustable over a 44 dB range in 1dB steps to allow an exact match to the input signal level, maximizing the dynamic range and signal to noise ratio.