CM15A
From CT.wiki
The CM15A is X-10's PLC interface, introduced in late 2004. It incorporates a 310MHz RF receiver, a 310MHz RF transmitter and a two-way PLC interface. It connects to a PC using USB instead of RS-232. Physically, the CM15A is about one inch wider and one inch longer than the CM11A and lacks the feedthrough outlet that was on the CM11A.

