Exceptional Audio Quality: With advanced audio technology, MKJ wired headphone with 2.5mm jack offers outstanding sound on both ends of the call. The superior noise cancelling microphone of this headset reduces most of the background noise, your voice will be heard loud and clear. | Great Durability: Quality materials are used to ensure the 2.5mm headset for Panasonic phones are robust for busy environments. The reinforced cord is built to withstand the demanding environment and is protected against office chair wheels, sharp objects on daily use, the durable construction will allows headset for a long time use | Comfortable Wearing: Its lightweight and ergonomic design ensure the phone headset can be worn comfortably all day. This wired 2.5mm telephone headset is developed in lightweight materials and soft ear cushion for optimal comfort, and the headband is adjustable to fit for different head sizes, and flexible microphone boom provides precise positioning | Quick Disconnect: Quick disconnect (QD) is an essential feature for communication headsets, users will be able to leave desk without taking headset off and also change the length of the headset line for better wearing in seconds | 2.5mm Headset Compatibility: This telephone headset with 2.5mm jack 100% compatible with landline telephone with 2.5mm headset jack, such as Cisco SPA 501G, 504G, 508G, 509G, 525G, SPA921, SPA941, SPA942, SPA962 etc, Panasonic KX-NT136 KX-NT343 KX-NT346 KX-NT366 KX-DT321 KX-DT333 KX-DT343 KX-DT346 KX-DT521 KX-DT543 KX-TG6531 KX-TG6532 KX-TG6533 Vtech Uniden Zulty etc.