This accessory secures two AA cells (batteries) into the battery compartment of the ULXD1, PR9RA, P10R, and UR5. Some brands of AA cells have slightly smaller dimensions than others. This plastic carrier properly positions the AA cells in relation to the battery terminals. The carrier may not be necessary for all brands of AA cells, but its use is recommended as it assures proper battery terminal alignment. The carrier is black plastic molded with the Shure logo and two “+” signs. The carrier is 53 mm long and 31 mm wide.