The B-DF4 is a four-channel Dante beltpack with an integrated loudspeaker and OLED display. Microphone gain is adjustable from 30 to 60 dB, with configuration for phantom power, high-pass filtering, limiters, sidetone, talk-key modes and headphone routing. The display provides clear unit and channel status, while the controls support operation through either the built-in speaker or headphones. Power can be supplied by PoE or from an external 9–16 V DC source.