BenQ FP231W - Manual (Page 11)

11 How to install your monitor hardware
Adjusting Your Monitor
Monitor Height
9. Plug the other end of the power cord in a nearby wall
socket.
10. Press the Power button on the side panel of the
monitor. The power indicator will light up.
To prevent from the springing out of the monitor stand, please press the top edge of monitor stand
while you press the release button to adjust the monitor at a preferred height.