It's show time! The event co-ordination involves communication with different parties, e.g. giving lighting cues to lighting engineers, deploying the movements of props. And instant communication between engineers would be particularly crucial in tackling sporadic problems happened in the course of event. To our past experience, we find that walkie-talkie per se causes the communication problem as it may not work well and it is hard for technical layman to tune to the right channel. So, we would provide the most user-friendly and reliable internal communication system to enable the smoothest communication.