Oh and which well defined common bluetooth standard? V2? V3? V4? There's a weird mesh of which devices can talk to which receivers. Just the other day I bought

Oh and which well defined common bluetooth standard? V2? V3? V4? There's a weird mesh of which devices can talk to which receivers. Just the other day I bought a new V4 USB receiver that refused to talk to an old wireless headset, and problems like these are emdemic. You know what format didn't have these problems? 1/8" headphone jacks. Because it is simple, and analog, and DOESN'T CHANGE.