Up to 1100ft Los and Distortion: Solidcom C1-2S Full-Duplex Wireless Intercom Headset is Hollyland's first true wireless System with No Beltpack or Base Station. You can add more remote headsets to build a 6-user system without a Hub. Adopting the latest technology in 1.9GHz frequency, the C1 headset supports up to 1100ft Los range with only a 40ms delay.Stable Connection and Security: Built on a stable platform with powerful Encryption technology, the Solidcom C1-2S headsets prevent people outside the system from hearing your conversation. Designed with a dual-antenna diversity scheme that enhances anti-interference capability and guarantees secured and constant team communication even in complex scenarios.