Pictured is the "Defender Team Leader" inner helmet mount headset with speaker for RX and noise canceling boom for TX. Variants include the "Line Operator" system which is listen only and looks exactly like the pictured system but the boom microphone is not included. The third variant is the "Command/Over-Watch" system pictured below coupled with a second speaker which mounts on the opposite inner side of the end-user's helmet. This system allows for dual comms between the wearer and line operators (issuing instruction) as well as a Command Post off-site.