They were the WF-500’s. I have a high end pair of Bose earbuds for music, but for audiobooks at work I just wanted something decent. What really got me to return them is I couldn’t use them single ear and have controls. Bought some Monster brand Chinese earbuds for dirt cheap, it’s my third pair from this brand and for the most part I get a good 18 months out of them before they have connection issues or the battery doesn’t last.