I clicked "All wallets" from the landing page and then "All filters" - bam. Allows you to filter by material.
1.28 MHz is about 100x over the limit humans are capable of hearing, so it's unlikely this is for a (musical) synth :)
Okay yeah, I can understand the complaints with that added bit of context. They couldn't even bother rotating the logo for that one, lol
I'm sure it's accurate, just sounds like such an outlandish concept! Might have to check it out