All we know for sure is from the November 26 COB L

All we know for sure is from the November 26 COB Letter

"Modifying the product design and building up production capability. One of our customers wanted major design changes to our 720 hour device. This required extensive internal design changes to the device and modifications of the manufacturing processes. In addition this customer wanted to completely redesign the packaging. Coordinating all these changes resulted in extensive communications with the customer’s design team (and their top management) as well as nightly calls to our overseas manufacturer. There were surprisingly few bumps in the road and we are well on the way to fulfill their order. Importantly, this experience has greatly enhanced our core capabilities in product design and manufacturing."

https://investorshangout.com/post/view?id=5973850


It's pretty safe to assume this was for the KT Wave. As to what the "extensive internal design changes" were only BIEL, KT and CICD know for sure.

One important takeaway from this info is that KT, spending to redesign the device, is in this for the long haul and IMO we will see more KT PSWT Products.