the 'ultra-slim' claim is a lie. The keyboard is, indeed, 'ultra-slim', and then you look underneath, and... whatisdis?! An ultra-thick internal battery compartment, oh no! Put THIS into your ultra-slimp laptop-sleeve, ultraslimistas!
With the EX1 and the EX3, Satechi shows that even ultra-thin keyboards can have a modular battery that can be replaced in just a few steps. With a USB-C dongle and Bluetooth, macOS and Windows support as well as a relatively affordable price point, the keyboards are intended to appeal to many groups of users.