and requires collecting pull tabs.I'll stay with my plan of collecting lots of pull tabs to find gold rings.Yea I've read that book about sutler round signals for gold rings I'm not sure if its better for selling books than finding rings.Working on the flight line around jet fighters for four years kinda hurt my hearing,but I have found more rings than on these how to book covers.IMHO make friends with pull tabs and you will find lots of rings no matter what detector you use.