The Loop- 2.5mm Headset for Vocera B2000 Badge. 2.5mm Headset for Home Cordless Telephones. Corded Headset Custom headset specially designed for use with Vocera B2000 Communications Badges In-line microphone approved by Vocera Earbud cabling allows for use in either right or left ear Magnetic earbud holder holds the earbud securely out of your way when not in use. No more dangling earbuds or tangled cords! Works with any 2.5mm cordless home telephone