Dexcom receivers, old style

When Animas went belly-up, I was going to go with Medtronic 670 but use Dexcom CGM. Then I saw the new, phone-looking style, too big to fit in my bra. So I went Tandem Tslim so that I wouldn’t need a receiver. Anyway, I now have a collection (4) of old style receives. If plugged into charge, they all will buzz when the button is pushed, and at least two of them will show the Dexcom logo. So, if any techie, who knows how to make them work, wants them, send me a message and I will mail them to you.