Lumenradio V-Mount Battery Holder; Kit with bracket to add a V-mount battery holder for Stardust, Aurora or Luna; Attaches to the sides of either of the units using two of the chassis screws; Plugs into the DC power barrel plug using the threaded barrel connector on the rear of the units; Allows for battery operation of the devices for several hours, depending on battery capacity; A typical battery of 190 Wh can operate Stardust for 10 hours and Aurora/Luna for 30 hours as transmitters, even longer if used as receivers