The Panasonic KX-TCA400 Lightweight Microphone Headset for Telephones delivers a comfortable fit that is sure to please any user. This headset works with any telephone that has a standard 2.5 mm mini-jack. With the lightweight headset you are able to move around with ease. The headpiece fits securely around your head and folds down neatly for compact storage. The adjustable noise-cancelling microphone boom is reversible, so you can wear it on either ear.