I dont know about this machine guys,I have been using it a couple weeks and the audio has stopped working on the speaker.It must have come unsoldered or something.I have to wear headphones now. I have not dug anything deep but big iron,I have been trying to listen for those faint but repeatable signals and right now its about 50 percent. half of them are small targets not deep enough to be a faint signal in the first place,and the other half are falseing. I dug two holes this afternoon that were reading solid 80 vdi four ways, dug the hole and its gone.The air tests on my machine are not impressive in my opinion either.Can you change the modulated audio to the non modulated like on the Cabela's model? I dont think I am a fan of the modulated audio.