Color: Binaural M510DSCThis headset is for Cisco phone only. If you have different phone brands, please check in different sizes. Super Comfort headset for offices/call centers/home phones with great durability and ultra good noise cancelling mic, fully rival with Plantronics and Jabra expensive models. ONLY COMPATIBLE WITH following Cisco Unified IP Phones that with RJ9 headset port 7931G 7940 7940G 7941 7941G 7942 7942G 7945 7945G 7960 7960G 7961 7961G 7962 7962G 7965 7965G 7970 7970G 7971 7971G 7975 7975G 6921 6941 6945 6961 7821 7841 7861 8811 8841 8851 8861 8941 8945 8961 9951 9971 Plantronics Amplifier M10 M12 M22 & MX10 Vista Modular Adapters ? COMPATIBLE WITH iPhone Samsung LG HTC Blackberry Huawei ZTE Cell Phone & Most Android Phones with 3.5 mm Headphone Jack ? PLS NOTE IT DOESN'T COMAPTIBLE WITH CISCO SPA SERIES