2.5mm Earbud Headset - Original (OEM) for Blackberry 8820 OEM: HDW-03458-001 / HDW-12420-001 This includes in-line microphone with call answer and hang-up button. BlackBerry 2.5mm OEM Earbud with On-Off. Rubberized ear-bud headset, with foam cover, fits snugly into the outer ear canal.