https://arstechnica.com/gadgets/2019/09/kobo-debuts-libra-h2o-e-reader-updates-software-with-more-tools-for-readers/

Nearly one year after releasing the Forma e-reader, Kobo returns today with a new slab dubbed the Kobo Libra H2O. The $169 e-reader retains the skeleton of the Forma, but is actually a smaller device. It has a 7-inch, 1680×1264, 300ppi E Ink display, down from the Forma's 8-inch display, but it has the same side-chin with page-turn buttons. Notably, Kobo moved the power button from the edge of the e-reader to the back of the device, and it's now a slightly indented circle that's easy to discern from the device's slightly textured back.