Frenquency Chart of Hollyland Wireless Video Transmission System Hollyland Tech February 25, 2023 02:07 Updated Mars Series Cosmo C1 Syscom 421 / Syscom 421S Cosmo 600/1200/2000 Related articles Hollyview APP Connection Installation---Cosmo Series Firmware SOLIDCOM M1 & MIXER How to transmit 4K video on Mars 4K? Comments 0 comments Article is closed for comments.