Panasonic Compact & Lightweight Hands-Free Over-The-Ear Clip-On Headset with Adjustable Microphone, Volume Control & Mute Switch For The Panasonic KX-TGA660M DECT 6.0 Plus Technology Digital Cordless Phone System Handset Adjustable, Boom-Style, Noise-Canceling Microphone Provides Optimum Voice Clarity Level and Reduces Background Noise Hands-Free, Clip-On Over the Ear, Comfortable and Lightweight Design Reversible for use with Either Ear, right or left Convenient In-Cord Volume Control & Mute Switch with a 4 foot cord and lapel clip for unfettered movement Uses standard 2.5-millimeter jack, designed for use with almost all cordless phone