I got my CTX used. It came with headphones that had to be plugged in but included the wireless module so I ordered a pair of Koss headphones that are the same as the ones included with purchase but even though I hear it the start up tones in the phones when I plug them in, the signals continue to only be audible through the detector speakers instead of the head phones. Is their something I'm not doing or how do I get this corrected? Also how does one put batteries into the wireless module? I did not receive an owners manual.