It looks like you're looking for the for the Acer Iconia Tab 6120 (often referred to as the Acer Iconia Tab W500 or Iconia Tab W6120 — a dual-screen Windows 7 tablet from ~2011).
To be clear: the dual-screen laptop/tablet ran Windows 7 and used a proprietary Ring Keyboard and virtual keyboard software that relied on Acer’s now-defunct drivers and utilities. acer iconia 6120 virtual keyboard software 11