Ok the walkies that we have are Motorola EM1000 Series (or maybe this one is the model #, not sure: KEM-PK 14190-67). We have been turning them off before plugging in the headset. As the instructions said. And now there is a new problem. This only happened when we tried this today, but the headsets won't stay plugged in. It's like the jack isn't big enough or something. So now when we plug them it, all the buttons inexplicably lock on the walkie. Also there is a switch on the headset cord that shows a mic on one end and a mic with a line through it at the other. We assumed that this was a mute button, but is it a VOX/PTT switch? (The headsets came sans instructions or label.) But regardless of the postion of this switch, the walkies now become unusable as soon as we plug in the headsets.