4 sets (HUB version or without HUB version) in maximum at the same range in 350 meters.
a. The distance between two hubs is at least 1.5 meters when multiple Solidcom C1 Pro hub-based systems are cascaded.
b. You are advised to install the hub at a place higher than 1.7 meters in an open space. A confined environment may affect the wireless signal quality and reduce the transmission range.
The firmware requirements: Solidcom C1 Pro HUB-based system versions later 22.214.171.124 , Solidcom C1 Pro no-HUB system versions later 126.96.36.199.
Firmware upgrade manual: https://drive.google.com/file/d/1LU6EOowPeWqxS-Sn-dVc9Bb-oBiz0slo/view?usp=sharing