... the base of each desk fan (shown below), and a single "On/Off" button on the top back ... fan is on, you can then program a custom message.* To program a message, push and hold the middle of ... C) to scroll through the alphabet.* Once you've decided on a letter, press the middle of the three red ... go to the next character space. - The left red button (A) allows you to choose symbols such as !, @, #, %, etc ...