Status on 2021/01/11, 05:58

Went dumpster diving this weekend (an incredibly fun and rewarding hobby for a hacker!) and found these two interesting pieces of hardware lying there. They have a microUSB input jack as well as a 3.5mm output jack, and though I'm not sure ergonomic they might be as keyboards, I want to know if I can use it for something else.

Does anybody know what they are, or have used them ever? Upon connecting them via USB, they have IDs 2341:8036 and 2341:0036 respectively, which points them to some kind of Arduino board. What can I do with them?