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 compatible with home businesses, offices, call centers, and moreEliminates the need to have more than one headsetcompatible with IP phone headset jack compatible with 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. new and !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.