3.5mm TRRS female to 4P4C male plug Use your existing , , or similar TRRS headset with your IP-based phone Avoid having to purchase an additional headset Ideal for businesses, offices, call centers, and more Eliminates the need to own multiple headsets Compatible with IP phone headset models: 6921, 6941, 6961, 7931G, 7940, 7941G, 7942G, 7945G, 7960, 7961, 7961G, 7962G, 7965G, 7970, 7971, 7971G, 7975, 7975G, 7985, 7985G, 8941, 8945, 8945G, 8961, 9951, 9971, etc. Also compatible with Plantronics M10, M12, M22, and MX10 Vista headsets High-quality construction Type: 3.5mm earphone to RJ9 phone adapter Color: Black Material: ABS+PC Length: 31cm Package Contents: 1 x Headset to RJ9 Cable Note: Only the above package content is included; other products are not included Note: Light and display differences may cause slight variations in color appearance Measurement error allowance: +/- 1-3cm