ONE HEADSET FOR MULTIPLE DEVICES. This office headset comes with RJ9 and 3.5mm connectors for both landline desk phones, cell phones and PC laptops. With 3.5mm connector for iPhone Samsung PC laptop and most other Androids. With RJ9 connector worksfor Cisco IP Phone 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 8961 9951 and more.. This headset is extremely lightweight and sound great. It took us less than 10 minutes to connect the headset and start using it. You can also look at some quick YouTube videos to connect the headset to your desk phone real quick. You’ll get several ear pieces that allow you to find an accurate fit. Free 2-day shipping. Buy Phone Adapter - Smartphone 3.5mm to RJ9 Adapter Convertor Cable PC Computer Headset Telephone at "/>Telephone headset rj9 connector