I just picked up an At Pro. I took it out in the front yard with my grand daughter. I was digging up a penny when she hit another good signal and sure enough it was a penny too. She`s five years old and has her first coin. I didn`t get any headphones with it and see that it has a special hook up for them. so I recon I`ll need either an adapter or some made for it. do the adapters work well with other headphones or should I get some made for it. Thanks!