To avoid interference with other devices, the wireless intercom system Hollyland Solidcom M1 communicates over the 1.9 GHz spectrum and offers full-duplex conversations. With full duplex, you can talk to other team members as you would over the phone, with each party being able to talk and listen simultaneously. The built-in panel antenna on the M1 base station can provide one-way transmission to beltpacks up 400 m away fronting the panel, and an extra 50 m at the back (line-of-sight). Auxiliary external FRP antennas can deliver 360° reception at up to a 300 m range. The the sidetone function can be used to hear yourself through the headset. This helps to ensure that your mic is picking up your voice, that your voice volume is properly set, and more. The wireless intercom system Hollyland Solidcom M1 can also be connected to a second Solidcom M1 using the Cascade Connection function, linking both base stations together. This helps if you need to expand your coverage and team support.