Compatible with most cordless telephones with a 2.5mm headset jack. Monaural, over-the-head design with a flexible, adjustable headband for a comfortable, secure fit. 4ft. cord provides extended reach. Cord clip provides additional utility. Adjustable microphone provides optimal voice clarity. Reversible design lets you use either ear. Panasonic (R) KX-TCA400 Lightweight Headset, Black is one of many Headsets & Microphones available through Office Depot. Made by Panasonic.