Radial Engineering Relay Xo, Radial Engineering Relay Xo, Balanced signal switch, To switch the microphone signal from PA to intercom for technicians or musicians, Also suitable for 2 separate inputs on the mixer with different signal processing, XLR microphone input, XLR / jack combo JR1 remote input, XLR Output A and B, Switchable Gnd / lift, Operation with 15V DC power supply, For operation the Radial Engineering JR1-L (Art No.#404026#) or JR1-M (Art No.#404027#) is required