The Motorola Multi-Button PTT Feature Licence Key (HKVN4284A) activates the Multi-Button PTT feature in DP4000 Series radios, excluding DP4000 Ex models. This feature allows users to enable Multi-Button PTT functionality on compatible peripheral devices, enhancing communication efficiency and flexibility. With this licence key, users can assign multiple push-to-talk buttons to different talk groups, ensuring seamless and instant communication across various channels. Designed for professional and mission-critical environments, this feature significantly improves operational capabilities and response times.