Send and receive X10 signals. Develop your own X10 compatible products for sale without the cost of UL approval. If you know how to send and read RS232 type serial communication with your computer or from any other electronic device, you can develop and market your own software and/or hardware for use with X10 compatible systems without having to develop your own X10 communications hardware or having to go through costly UL approval. This module is optically isolated and UL approved. The timing critical nature of communication with this device requires low level hardware programming experience. It may also require dedicated microprocessor time. It is not recommended for casual programmers.