It is an Apple Watch SE. The invoice says APPLE WATCH SE 40 SI AL WB SL GPS-USA MRE33LL/A Serial No.:(H7369Y405W).I bought it to sync with the treadmill as my handy Garmin watch lies about treadmill distance and incline. When this connects, it knows all about the treadmill workout. Sometimes it does not connect. Is it the watch? Is it the treadmill? Is it me? I don't know. And I don't want to figure it out. I'll just use the Garmin and calibrate, and know the incline counts even if the watch does not know about it.It shipped March 12, so I had it about two months. Fully functional, no scratches.