I just bought a AT Pro so i would have something to use when it is raining or in the water along fresh water lakes. It does not look like it was hardly used. It came on and sounded off on a coin when i went to buy it. I get it home and go over it checking everything over to familiarize myself with it. I checked the batteries, unplugged the head phones and the coil. Then put hooked everything back up pushed the button powered it on, then pushed and held power button in till i got the double beep to restore it to factory settings. Now it does not sound off on anything. It powers on and off like it should just does not detect (sound off) whats going on. Beginning to think i should not have bought a garrett.