Earthcalm Resonator an emf protection tool

I purchased a Resonator several years ago. ($240) current retail price. It was muscle tested when purchased to verify any positive benefit when using this little pendant. It tested positive at that time at their booth. But, I recently retested it several times and it had lost it’s effectiveness. I called the EarthCalm.com home office . I asked to send it back and either have it recharged or replaced. They told me there was nothing in the unit to recharge and that it would never wear out in a life time of ownership. Then I asked to have them to take mine back since they told me had a life long reliability, and replace it. They refused. It is clear that the construction of this emf protector, has nothing significant worth spending money on in the first place since it wears out and the company has no way of restoring it to it’s original effectiveness if was effective in the first place. I am not discounting that there are products that can protect against emf, but this isn’t one of them.. Don’t waste your money on EarthCalm products, it’s a rip off.