The Advanced Installed System includes the LR-500 Programmable Receivers, a charging case and rechargeable batteries to add functionality and value to your system. Perfect for where your guest changes the channel to find the audio source. The LR-500 receiver can be programmed to receive only the channels you are using. You can also substitute any accessories to better meet your needs, such as substituting a rack mount kit, antenna. Use this system for auditory assistance, in-ear cueing, board and training meetings, and overflow areas. Great for outdoor events, corporations, theaters, and houses of worship.