Plantronics SupraPlus HW251N Wideband Monaural Headset with Ultra Noise-Canceling Microphone For Quick Disconnect P/N:64338-31
Amazon.com: Factory Essentials HD251QD with U10 - Mono headset with USB-A Adapter. Comparable to Plantronics SupraPlus HW251 with DA45. Works with Phones and PC : Electronics