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 608 MHz (470-614 MHz for export versions), with a selectable output power of 25 or 50 mW. 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 -20 dB 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 1 dB steps to allow an exact match to the input signal level, maximizing the dynamic range and signal to noise ratio.

24 bit/48 kHz digital conversion Tunes across entire UHF frequency range 256-bit encryption - AES 256-CTR Selectable RF power at 25 and 50 mW USB port for firmware updates Wide range input gain adjustment DSP-controlled input limiter Two AA battery power Solid machined aluminum housing