Mounting bracket frame for optional modules

Optional module expansion frame. This needs to be installed in Challenger 1000 and Focus Portable PA systems to allow the installation of the BT-500m, DP-500m, and additional SDR-5116 and SDR-6116 modules: Bluetooth module, Digital player module and additional wireless receiver modules. In both the Challenger 1000 and the Focus 505 it goes where the CD player was if one was installed. i.e. you can't have the Cd player if the MB50 is installed. The Stage Pro portable PA systems come pre-installed and included in the price.