T5577 or UID chip RFID Black Ceramics Smart Finger rewrite Ring 125KHZ/13.56MHZ Wear for Men or Women (T5577 125KHZ-19MM)

So I've been searching for the perfect T5577 ring for the card readers at work. I hate having to dig out my ID card or wear a lanyard only to keeping pulling it out at every door. I like rings, so this was a win/win for me. I initially had one of those R5 rings and while nice having 6 writeable cards, I realized I only really used one. The R5 was big and bulky and only had three sizes. But this ring is super lightweight, very slim and comes in many sizes. It feels like a regular wedding band or something of that size, but lighter. I hardly feel it on my finger. It was easily writeable, and works very well on the the doors here at work. Now I can just fist bump the key lock and I don't have to fumble around for a key card. Looks VERY stylish, has a nice two tone subtle color to it. I highly recommend this ring if you are looking for something like this. The ring size is true to size when ordering, so make sure you measure your finger the correct way. Very happy with this purchase, probably will buy a few more for backups.

First ring I received I could not program. I could not read or write it, with a couple of different devices. Thankfully Amazon makes exchanging it super easy, and I got a replacement the day after I requested it.I had no issue writing a code to the replacement ring, and the first couple of times I used it it worked great. Fast forward a few weeks later, and it still works...usually. I programmed it to work with both a gun safe and the door system at my work.Fortunately, it works much more reliably with the safe, but unlike even the cheapest of key fobs I've tried at my work, it has to be touching the sensor, and even then I often have to run it side to side a few times before it will read it.Overall I'm satisfied, but I wish it were a tad more reliable.UPDATE: Less than 6 months later it broke. Not even sure when it happened. I was sitting at work, and felt it pinching. took it off and there is copper wire exposed on the back and a giant chunk of the ring missing. Add poor durability to its highly unreliable performance.

The media could not be loaded.  The device seems to have a limited range, and to get the placement correct to program was a matter of trial and error. But was easy enough, and seems to work flawlessly. I have had it for a week and notice no damage or scratches. Fit was spot on my gauge. Color is shiny black.

Been wearing this 24/7 for a year now... still in great shape and works every day. It even looks great, and people complement me on it!!No idea why everyone is complaining about breaking it... Maybe I got lucky and mine is built better, but I'm a handy man / home mechanic / Engineer and I use my hands A LOT. I wear this in place of my wedding ring, so I never take it off. No cracks, no breaks, no issues.... Works every time I need it to.Excellent product!!

The sizes are not accurate. I had to send back the first one and get the next size bigger. They are listed as Metric sizes, but they actually measure as an American ring size, the next size smaller. For instance, I purchased a 21mm, but it actually measured out to 20.6mm which is basically a size ll ring. The 22mm ring that I got as a replacement measures 21.49mm which is a size 12 ring. Besides that the RFID works good, and it seems to be holding up good.

Versatile device . Ordered it out of curiosity . Didn’t disappoint . Of course as with all 5577 devices , it has a limited distance of about 1 inch .but it does work and nothing like just waving your hand past the reader.

Doesn’t work as advertised, my rfid reader doesn’t prick it up at all. Works with other right before/after.Fails to work as rfid, works as a round object

I don’t leave reviews usually but this product only had so-so reviews probably. It does exactly what you would expect. I had the 125khz version. Out of the box I got it programmed in a couple seconds with on of the 10$ rfid cloners. It has better range than I expected and works in any direction. People seem to expect that the ring will have the same range as a card which has a drastically larger antenna. This works from about an inch away and near instantly so I can open my door even with bags in my hands.10/10

I have been using this as my daily for opening doors around work, the only two downsides are:It is pricey for an RFID tag (but I knew that when I bought it)The ring is the coil, makes sense right? But then how do you align the coil with the reader?I've found there is an angle that works okay with most readers but you cannot simply walk up to readers and 'fist bump' them because then the ring is at 90% to the reader and it won't pick up.

Great item which looks good and functions perfectly.