Thanks for sharing our new 3.5mm and 4.4mm Headphone jack cover. You can find this on our
website too.
TBH, we are doing this as a service to our users. The engraved pattern is borrowed from the volume control knob on N8ii and N7. They are a bit expensive when compare to other plastic dust covers, but we aren't making any money either because of the tedious process to get this right and in a relatively small production quantity.
While these dust covers can be used in any 3.5mm and 4.4mm phone port, they will help to solve one small design problem with N7. When you put N7 into the leather case, the laser marking of the 3.5mm and 4.4mm connectors will be covered by the edge of the leather case, making it very difficult to differentiate between phone output vs line/pre output, so there is a small risk that you'll plug your IEM/headphone into the line/pre ports, or vice versa. Adding these headphone jack cover to N7 will cover up one pair of outputs, so you can differentiate the phone out from the line/pre out immediately.