The A-BOOM 2 is a boom pole mount designed specifically for the A20-TX transmitter. It mounts to the top of a cabled or cableless boom pole. It can be positioned facing up or down the boom pole, and the onscreen text of the A20-TX screen will conveniently rotate to allow you to read it at the right orientation. The A-BOOM 2 will also hold A10-TX transmitters.