The Motorola RLN6423A / HKLN4604 is a lightweight earpiece for your Motorola RDX, XTN / CLS/ AX / DTR series radio. This headset features a swivel earpiece allowing it to be worn on either ear. It allows you to talk and listen without holding your radio. The sensitive microphone offers excellent sound quality. It has an inline Microphone and push-to-talk button for easy communication.