JoshuaD11. I just looked at the earliest Reviews on Amazon on the power port II and they go back to 2016. It may not be exactly 48 months but the one I got was acquired through the power user program. There are no dates on the power user log and the review links are useless, but I still claim that I've had this device for a significant amount of time and it is still working to this day just fine. It has been constantly used and abused not only in my previous job and residence that I moved out of in early 2017, but has traveled with me before that on at half a dozen road trips and a cross country business trip I took in late 2016.