Menvier30/40/100/300 1. IntroductionPage 13Figure 4. Two-Way Key Fob ButtonsOperating the buttonsTo ensure that the fob does not accidentally operate while it is in yourpocket, the buttons are deliberately slow to respond to pressure. You musthold down the button you intend to press for at least three seconds toactivate its function.Once the fob recognises that you intend to press a button, a red LED nextto the button will flash three times quickly. At the same time the fob sends aradio message to the control unit of your alarm system.After carrying out the function you selected on the fob, the control unit willsend back a signal to the fob. The fob lights a green LED next to theappropriate button for three seconds. The green LED is your confirmationthat the control unit has carried out the function indicated by the button.Radio Hold Up Alarms (HUA)A radio HUD is a two button transmitter, used to start a Hold Up Alarm(originally known as “PA”: Panic Alarm or Personal Attack). To activate thetransmitter you must press both buttons at the same time. On some modelsa third button acts as a lock so that you can prevent the HUA accidentallyoperating when carrying it in your pocket (see Figure 5).Unset LEDUnsetPart set LEDPart Set(programmable)SetSet LEDQuery LEDQuery