ONLY WORKS with Plantronics M10, M12, M22 & MX10 Amplifiers or CISCO IP phone models :
Cisco IP 6921, 6941, 6945, 6961, 7821, 7841, 7861 Cisco IP 7940, 7940G, 7941, 7941G, 7942, 7942G, 7945, 7945G Cisco IP 7960, 7960G, 7961, 7961G, 7962, 7962G, 7965, 7965G Cisco IP 7970, 7970G, 7971, 7971G, 7975, 7975G Cisco IP 8811, 8841, 8851, 8861, 8941, 8945, 8961, 9951, 9971 or AVAYA CALLMASTER V VI

ONLY COMPATIBLE FOR SOME SPECIFIC PHONE MODELS LISTED ABOVE. Not compatible with Cisco Spa phone series.
FOR OTHER PHONE MODELS, PLS CONTACT US FOR COMPATIBILITY GUIDE OR ADVICE.

• ONLY For Cisco 6921, 6941, 6945, 6961, 7940, 7940G, 7941, 7941G,7942G, 7945, 7945G, 7960, 7960G, 7961, 7961G, 7965G, 7970G, 7971G, 7975G, 7985G 8941, 8945, 8961, 9951, 9971 IP Phones.
• All functions on headset and phone would function same
• Convert smartphone headset to 4P4C RJ9/RJ10 plug for office telephones.
• Please Check the Compatible Phones list before your order.DO NOT BUY THE ITEM IF YOU CAN¡¯T FIND YOUR PHONE MODEL IN LISTS, CONTACT US FOR ADVICE

ONLY For Cisco 6921, 6941, 6945, 6961, 7940, 7940G, 7941, 7941G,7942G, 7945, 7945G, 7960, 7960G, 7961, 7961G, 7965G, 7970G, 7971G, 7975G, 7985G 8941, 8945, 8961, 9951, 9971 IP Phones.VoiceJoy