WIDE COMPATIBILITY: MAIRDI telephone headset includes RJ9 jack and 3.5mm jack, allowing one office headset for multiple devices. With quick disconnet plug, you can switch between landline deskphones, cell phone, PC laptop and more, works for Cisco IP Phone 7931G 7940 7940G 7941 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 and more. | OUTSTANDING SOUND QUALITY: Phone headset with HD audio sound and voice lets you have lifelike, vibrant conversations.You can hear music and conversations with complete clarity. All tones, from high to low and everything in between, sound full and natural. Corded business headset with noise-cancelling microphones reduce unwanted background noise and are ideal in noisy work environments. | ALL-DAY COMFORT: MAIRDI call center headset comes with large size soft leatherette ear cushions for super comfort wear. Adjustable headbands for different head sizes and 330° rotatable microphone boom enable you to find perfect fit with this communication headset. | BUILT TO LAST: Most durable RJ9 headset with stainless headband, quality plastics and thoughtful design make it very tough. Reinforced Kevlar cord is built with the monaural headset to withstand demanding environment and is protected against office chair wheels, sharp objects and daily use. | ERGONOMIC DESIGN: This customer service headset has a quick disconnect plug (compatible with Jabra headset). You can leave desk while on call. Hearing technology removes sudden loud sounds or tones before they reach your ears.This keeps the sound level in the safe range and protects the user against sudden high peaks in volume.