Ideal for multi-channel applications in larger venues, the LS-51-072 Listen Ultimate Level II System combines everything needed for assistive listening performance and compliance in one package. Four LR-500 Portable, Programmable Display RF receivers offer listeners the option of choosing from the available channels while providing them with battery level and signal strength information. The LT-800-072 transmitter offers a full range of 57 channels to choose from, and the universal antenna kit and rack mounting kit make it easier to install and set up the system immediately.