3.5mm TRRS female jack. 4P4C male plugUse your existing i Phone/ P a d, or similar TRRS headset with your -based phoneAvoid having to purchase an expensive headsetGreat for home businesses, offices, call centers, and moreEliminates the need to have more than one headsetFor IP phone headset jack for 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, 8961, 9951, 9971,etc. P LANTRONICS M10, M12, M22 & MX10 Vista. and high quality Type: 3.55mm earphone to RJ9 phone adapterColor: BlackMaterial: ABS+PCLength: 31cmPackage Contents:1 x Headset Jack to RJ9 CableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.