1 Introduction i-on16Page 12appropriate 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 706r and 710r radio HUAs are two button transmitters, used to start aHold Up Alarms. (Hold Up Alarms used to be known as Panic Alarms.) Toactivate the transmitter you must press both buttons at the same time. Onthe 706r a third button acts as a lock so that you can prevent the HUAgoing off when carrying it in your pocket.Figure 5. 706r HUA ButtonsHUA With A Two-Way Key FobIt is possible to start a Hold Up Alarm from a two-way key fob. However,the Installer must enable this within the control unit. (Note that doing so willmean that the system no longer complies with BS8243 or DD243.).Once the Installer has enabled this feature, a Master User must also turnthis facility on, see page .When the feature is fully enabled, to start a HUA from a FOB-2W-4B:Press and hold any two diagonally opposite buttonsat the same time.All four LEDs flash red three times.The control unit starts a hold up alarm. If yoursystem is connected to an alarm receiving centre thecontrol unit sends a hold up alarm message to them.The control unit then sends a message to the fob toconfirm that it has started a hold up alarm.All four LEDs glow green for three seconds.HUALock