title: What is this button called? What does it do?
body: <p>What is this button called? What does it do?</p>
  <p>In the displayed screen, even though the &quot;Data Conn.&quot; shows dim, when I click that button I see it as &quot;Bright&quot; - Which view to believe?</p>
  <p>Thanks much.</p>
  <p><a href="https://i.stack.imgur.com/nEsEQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nEsEQ.png" alt="enter image description here" /></a></p>