Eartec UL5S 5-Person Full Duplex Wireless Intercom System

Five-Person Full Duplex Intercom

The Eartec UL5S is a professional wireless intercom system designed for five users who must communicate continuously while keeping their hands free. It includes one master headset that establishes the digital sequence and four remote headsets, all using single-ear UltraLITE designs. The package supplies five rechargeable lithium batteries, an eight-bay multi-port charger, and a medium softside case for transport and storage.

Replaces Wired or Half-Duplex Sets

This system upgrades teams that currently rely on tethered headsets or half-duplex radios that require push-to-talk operation. Full duplex lets all five participants speak and listen simultaneously, removing the delay and discipline overhead of turn-based protocols. The jump is worth it when crew coordination must be instantaneous, such as during live production, stage management, or aviation ground operations where missed cues create safety or timing risks.

Limited by Infrared Line of Sight

The headsets communicate over infrared, so each unit must maintain an unobstructed optical path to the others or to a central receiver. Range and reliability drop sharply when walls, bodies, or equipment block the beam, making the system unsuitable for multi-room venues or outdoor sites with heavy foliage. Buyers who need coverage beyond a single open area should evaluate RF or DECT alternatives instead.