The Hollyland HL-C1PRO-SH03 is a Solidcom C1 Pro Wired Headset for Solidcom C1 Pro systems with Hub. Perfect for use as a Master, replacement or backup headset it features dual-mic Environmental Noise Cancellation (ENC) for use in loud environments, and connects to the hub (available separately) via a 10-pin LEMO connector. to function as a master headset for this This full-duplex wireless DECT intercom system supports up to 9 users at the same time and allows for further expansion by daisy-chaining additional hubs to accommodate more headsets.