Specifications include, but are not limited to: Please note that MPD would prefer products or materials that are made in the United States of America. A. TECHNICAL REQUIREMENTS: Quantity: 40 • Connects MPD radios to microphone mounted inside gas mask respirator for clear, easy communication • Connects to 53/54 Series Voice Projection Unit (VPU) for simultaneous use of VPU and MPD radio • Mobile Field Force (MFF) headset with mask adaptor including acoustic tube earpiece and integrated mask connection, 4-pin headset plug, lapel microphone • Push to Talk (PTT) assembly featuring 12” fixed radio cable with choice of connector, 4-pin headset socket, alligator clip, waterproof switch • Dedicated respirator cable (Headset & mask input PTT) • PTT2 Headset and Mask input ports • Compatible with Avon APR, SCBA, and PAPR systems including FM54 respirators • NIOSH approved • Water resistant