The JK Audio RemoteMix 3 is a combined telephone line hybrid mixer and universal handset interface. JK Audio combined an audio mixer, headphone amplifier, telephone hybrid, and PBX telephone interface in one rugged unit. It’s perfect for remote broadcasts, sporting events, and field reporting from any location. Two XLR Microphone Inputs. Two ¼ Headphone Jacks. Time Delayed Peak Limiter and VU. Push to Talk Condenser. Microphone and Monitor Speaker. Runs 36 hours on two 9V batteries. DTMF / Pulse Keypad.