Has a top of the line 3389 sensor that tracks perfectly and I like the scroll wheel. I laid them sideways on my countertop to use the top as shelf space as well and then a corner shelf to close innthe square space betweenthe 2 sincei have them adjacent inna corner. It was also missing the cord needed for wired listening. Slim side bezels. If you like PMX 680s ergonomics, and dont like using in-ear while running, then again this is for you. Adds to my building laundry and makes it seem homey. Original review: I bought the speaker in the ?bulk packaging? category and it arrived with a blow out speaker on one side, some minor marks, discoloration, and marks on the device made with permanent marker. Soy programador y apenas llevo 3 semanas de uso y ya se ve el desgaste en las teclas desafortunadamente no eh encontrado repuestos en ningún lado. It will stay on till the battery is drained. I was impressed of the high quality of this mic.