Cisco Compatible Plantronics CS520 VoIP Wireless Headset Bundle with Electronic Remote Answer|End and Ring Alert (EHS) for 6945 7821 7841 7861 7942G 7945 7945G 7962G 7965G 7975 7975G Bundle of 2 items - Plantronics CS520 Wireless Headset and Cisco compatible remote|end and ring alert interface cable Compatible Cisco VoIP Phones: 6945 7821 7841 7861 7942G 7945 7945G 7962G 7965G 7975 7975G Weighing 94 grams the CS520 fits securely for all day comfort 9 hours of talk time gets you through the busiest of work days 350+ feet of distance gives you mobility throughout your office