Panasonic Hands-Free Headset with Noise Cancelling Microphone, Comfort Fit Headband, Mute & Volume Control for The KX-TGEA20B - KX-TGE232B - KX-TGE233B & KX-TGE234B Expandable Cordless Phones Adjustable, Flexible, Boom-Style, Noise-Canceling Microphone Provides Optimum Voice Clarity Level and Reduces Background Noise Hands-Free, Over the Head, 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 Panasonic cordless phones