[voltagex_]

The last time I picked up a $10 BT dongle, it had "CSR 4.0" written on it but was neither CSR (Cambridge Silicon Radio) or 4.0. Any hints?

[antsar]

Heh, name and shame the supplier? I ordered one of those from Adafruit. It was noticeably of "Chinese street market" build quality, but works great with a Raspberry Pi.