HP Slate 21
... that the HP Slate 21 is an Android tablet with a 21.5-inch (550 mm) screen?
... that the <b id="mwApc"><a href="./HP_Slate_21" id="mwApg" rel="mw:WikiLink" title="HP Slate 21">HP Slate 21</a></b> is an Android <a href="./Tablet_computer" id="mwApk" rel="mw:WikiLink" title="Tablet computer">tablet</a> with a <span about="#mwt40" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"21.5"},"2":{"wt":"in"},"adj":{"wt":"on"}},"i":0}}]}' id="mwApo" typeof="mw:Transclusion">21.5-inch (550</span><span about="#mwt40" typeof="mw:Entity"> </span><span about="#mwt40">mm)</span> screen?