Q: Why won't my TM751 Transceiver respond to X10 powerline signals? Is it defective?A: It's not defective. The TM751 (the transceiver included with the X-10 Firecracker kit) does not receive X10 powerline signals. It can only receive X10 wireless RF signals, which it translates into X10 powerline signals then transmits these signals onto the powerline. The TM751 can be used as an appliance module, as long as you plan on controlling it from a wireless controller or the firecracker. In addition, it does not allow the user to set the module number (it is always #1), but you can change the house code.