I haven’t heard from OSA Electronics ( https://www.osaelectronics.com ) for a long time. An order from February (Dacberry NTB) was not delivered. Emails will not be replied too. I write that so that you are warned and prefer to inquire beforehand.
I hope OSA Electronics comes back soon. The products are very innovative and the contact was very nice. The support for Volumio and also for the soundcheck was incredible. It would be a loss.
Best , jens