The Learner LNR66T model t is one of the most popular full sized school headsets in K-12 Education. It's legacy design has been a staple in K-12 computer and language labs for decades. They have been widely accepted and approved for various state testing initiatives. It is currently regarded by many educators as highest quality, lowest priced headset of its kind. The Learner LNR66T is a 3.5mm single plug heasdset with a four foot cord. The single plug combines headphone and microphone functions in a single plug. Use with laptops, Chromebooks, tablets, and other newer devices that have a single jack. The thin barrel plug was designed to fit in Otterbox™ and other popular tablet cases that will not accommodate standard barrel plugs. Its drivers provide clear sound reproduction and it's microphone is designed for clarity even in noisy testing environments.