The M300 uses a single-ear design and a lightweight headband so one ear stays open to the room. Users hear the call clearly while remaining aware of what is happening around them, which suits contact centres and reception desks where staff handle both callers and walk-ins. The microphone is a rotating noise-cancelling electret, and the headset can be worn on either ear. The structure passed 5,000 headband flex cycles, so it stands up to sites with high staff turnover.