Hello, We sell intercom Full duplex in France and we are looking for headsets with connectors 3.5mm jack with 4 contacts. We are looking for professional binaural and monoral headsets (example : RAN-2000AS, RAN-1000CF, RHS-0536, RHS-0436 or RHS-0226). It is for pro audio intercom system. I could also be interested in the following references (with 3.5mm jack connector): - RHS-0126 - REMB-0227 - RH-04 - RHS-0636 Can you send me a price for a sample for we test your products and the prices for 50 and 100 units by reference, I think we will order small quantities to start (50-100 pieces). You will find here the contact diagramm for the 3.5mm jack. Looking forward to your answer. Regards. Color:RedStyle:Headband Show More