The Kopul wireless audio direct box connects Bluetooth-enabled smartphones, tablets, laptops, computers, and other compatible playback devices to professional mixers, PA systems, powered speakers, interfaces, recorders, and studio monitors.

Bluetooth 5.3 provides reliable wireless audio transmission at distances up to 100 ft (30 m) and supports audio resolution up to 24-bit with sampling rates up to 96 kHz. It is compatible with Bluetooth Advanced Audio Distribution Profile (A2DP) devices for convenient wireless playback.

Two balanced 3-pin XLR outputs provide professional stereo connectivity, while built-in high-fidelity audio transformers help deliver clean audio to professional sound equipment. A selectable stereo or summed-mono output mode allows the unit to maintain a stereo program or send summed audio for flexible PA, recording, and playback configurations.

A stepless volume control provides smooth output-level adjustment, and the maximum gain is rated at +6 dB depending on the source. The unit has a 20 Hz to 20 kHz frequency response, 600-ohm output impedance, and a 90 dB signal-to-noise ratio.

A 3.5 mm TRS headphone output provides convenient real-time monitoring. USB-C 5 V bus power allows operation from a compatible computer or USB wall power source without batteries, and an on/off control can stop streaming without requiring the rest of the connected audio system to be disconnected.

The compact steel housing is designed for demanding professional audio use and is suited to live performances, backing-track playback, presentations, rehearsal spaces, studios, houses of worship, event systems, mobile DJs, and other applications where Bluetooth audio must be connected to balanced professional audio equipment.