Pre-Cut Back Battery Door Cover Adhesive Double Sided Tape Glue Replacement for Samsung Galaxy S21 5G SM-G991U G991U1 G991 (Pack of 2)

Does what you want it to do. Easy enough to apply.

Las medidas son las correctas, por lo que se ajusta muy bien.Ademas me parecio sencilla su instalación, los protectores de plastico te ayudan a posicionarlo de manera correcta.

Works on my Galaxy S21 5G (SM-G991U) smartphone, which I purchased directly from T-Mobile. I was having constant problems with the phone's microphone, as well as intermittent charging problems, so I installed a replacement charging port.It took a little bit of patience, but there's plenty of how-to help on YouTube. I watched 3 or 4 videos to get different perspectives, then went to work. This was my first time tearing down a phone (and I'm well over 60), but I felt I had nothing to lose. I'm glad I did, and the replacement was a complete success.I installed this new seal for the back cover, since the old one was damaged beyond repair. Maybe I should have applied more heat, but I don't know. As I said, it was my first time. I was at least smart enough to have the new seal on-hand. Installing it was straight forward. Two were in the package, and I was successful with the first one. It's nice to have a second one, just in case.BTW, I used about 10 binder clips to clamp the back cover to the phone. Most of the advice was to add pressure for 10 minutes, to as much as an hour. I used the clamps for a couple hours, and just left it alone. Better safe than sorry.

It works great