I'm sure a lot of folks would like to hear about it after some field use.... As far as the coil situation goes... That was my understanding as well. BUT, I couldn't help myself. I made 4 little jumper wires and carefully kept them insulated/isolated from each other and plugged them into the box. Turned it on. played with the threshold, sensitivity and what do ya know... it seems to be working. air tested a couple sub gram nuggets and seems to be same as 10"coil ????? Also worked in Non -Motion ??? I should have recorded it. 10 is back on now and works , so I guess I'll just leave it alone.