The HOLLYLAND Syscom 421S is a wireless intercom system designed for professional audio and video productions. It provides stable and reliable communication between up to 100 users over a range of up to 400 meters. The system operates in the 1.9GHz frequency band and features high-quality audio with low latency. The belt-pack transceiver is compact and lightweight, with a clear OLED screen and intuitive user interface. The Syscom 421S is a versatile and practical solution for film, television, and live event production teams.