Rolls HR70 FM Digital TransmitterThe HR70 is a digital display analog FM transmitter. Apply a signal to the XLR or RCA inputs of the HR70. Select what frequency you would like to broadcast those signals on (88 to 108 MHz) and you are now sending signals via FM radio, assuming the antenna is connected properly. The HR70 also has a talk over circuit built in. The H70 is especially ideal for situations where you can address a group of people in their cars for "parking lot gatherings"