Me 4.
It has a 600ml tank, that's about the only dimension in the booklet / on the box. The pic here gives you an idea of scale with the watch lying beside it: <!-- m --><a class="postlink" href="http://www.lidl.co.uk/cps/rde/xchg/lidl_uk/hs.xsl/index_16269.htm" onclick="window.open(this.href);return false;">http://www.lidl.co.uk/cps/rde/xchg/lidl ... _16269.htm</a><!-- m -->
Plenty of room for razors though (I cleaned a few to test the thing out!)