NOT FOR CELL PHONES OR COMPUTERS: Please note that this headset comes with standard 2.5mm jack, it will not works with cell phones or computers. 2.5mm Headset Compatibility: This wired landline headset is fully compatible with the telephone with a 2.5mm headset jack. It is compatible with Cisco Linksys SPA 303, 501G, 504G, 508G, 509G, 525G, SPA921, SPA941, SPA942, SPA962 etc, work for Panasonic KX-NT136, KX-NT346, KX-DT321, KX-DT543, KX-UT136, KX-TG6531, KX-TG6532, KX-TG6533, KX-TGF574 Vtech, Zulty, Uniden etc. Easy to Use: 2.5mm telephone headset with mic for Vtech phones makes your hands free during the phone conversation. This phone headset comes with in-line volume control for easy operation during the phone calls. You can easily adjust the volume up and down, and microphone mute when needed. Please note that some Panasonic phones need to program the headset button to make the headset works. Wearing Comfort: MKJ wired headphone with 2.5mm Jack works with Cisco SPA series phones. This call center headset features with adjustable headband to fit most of head sizes, a bendable microphone arm for an accurate talking position, and soft leatherette ear cushions for hours of comfortable wear. Its lightweight and ergonomic design ensures the 2.5mm phone headset can be worn comfortably all day. Great Durability: With high-quality materials (top PU and new plastic materials etc), corded 2.5mm phone headset for Panasonic phones offers great strength and durability even for long-period use. Ultra-strong Kevlar-reinforced cord will protect the headsets from office chair wheels, and sharp objects on daily use. HD Audio Quality: MKJ wired 2.5mm headset features a superior noise cancelling microphone to ensure clear voice transmission for the office workers, SOHO, or call center staff. The superior noise canceling microphone reduces background noise so the calls on the other end don't hear your surrounding noise, baby crying, or the tapping sound in the keyboard. Also, the dual ear headset design will reduce the outside distraction and help the users to focus on the conference calls.