Does anyone know a good bi-directional bluetooth adapter like the Jabra A210 Bluetooth Adapter which is getting pretty rare now. Apparently the Jabra also don't pair each other. I've built a 2 way radio wireless intercom 'system' which at the moment uses 2 bluetooth transmitters and 2 bluetooth receivers to get the mic output one way and the earphone the other way which isn't all that practical. I know Motorola and Sony do a home use one with USB port but I'd prefer something with internal battery. Also dunno if those Motorola or Sony units can pair with a sister unit.