To use this Clear-Com CC-400 headset, first connect the 4 - pin female XLR connector to your compatible device. Put the headset on your ears for a comfortable fit. When speaking, keep your mouth close to the dynamic microphone for clear communication. Be aware that some of the foam covering is deteriorating, so handle it gently to avoid further damage. For maintenance, you can use a soft, dry cloth to wipe the headset regularly. Don't expose it to extreme temperatures or moisture. If the deterioration of the foam gets worse, it might be a good idea to replace the foam parts.