Panasonic KX-TCA60 Hands-Free Headset for $8.27.  Shipping is free on orders over $25.  If needed, use this Filler Tool to qualify for free shipping.  Here is a screenshot for your reference.  It uses standard 2.5-mm jack and features a boom-style microphone adjustable for optimum level, 4-ft cord and lapel clip. Most places have this headset [...]