The HSP 321 is a professional corded single-ear headset that enables seamless two-way communication, allowing users to listen and speak simultaneously. The headset features an electret condenser microphone and a pivoting mic boom, ensuring flexibility and comfort for users in different settings. It is immune to radio interference from DECT and mobile phones, making it a reliable choice for communication in noisy environments. The adjustable headband ensures a snug fit for various head shapes, while the 0.9m cable provides ample length for movement.