So the only device I ever used with a manual battery befrore was a dse801 and I hated it, th ebutton protruded out so far and was hard to push comfortably, at that poingt I gave up on manuals, but then my SI USB pass thru came in, the button fits into it smoothly and is so comfortable and easy to press and I love using it. My question is this, are the Volt manual batteries designed the same way, if so I may have to look into getting a few cause I love manuals, I just hate awkward buttons lol