yeah by ir. you need to be in the same bunker to transfer so not really a comunication device. Useful as 1 person on team can set up timers, dwell, COPS and MROF for the game time/paint types. Then you can beam that to all the other guns on the team to save setting each gun. Even better if you havce a pda. Also can be used to fix electronic faults: done that to my gun.
Buy an angel (opps shameless plug).
Buy an angel (opps shameless plug).