Everything seems legit. Even the declining sales. Thanks for being honest and including that. Otherwise it t might "seem" the be a bit underpriced based on revs and the number of outstanding shares.
However. They are in a very crowded market of consumer electronics. Remember Nokia? Or how about that little phone company based out of China. The ticker was ZOOM. Yeah I don't even know if they exist anymore. Tho it was a very cheap stock to own back in the day. Maybe not so much anymore I dunno. Look it up.
Anyway, just my opinions and good luck with this cheap lil "darling".