Via the Bluetooth function, several units can be connected together so that, for example, match notes can be sent between the units. An inbuilt vibrator and beep signal alerts an official that another official requires their attention.
Before you connect SPIINTSO PDA units it must be agreed which official will be responsible for entering the match events, eg who will note goals, who will note substitutions, etc. The units can then be programmed as either Master, Slave 1,2,3,or Slave 4.
NB It is important to check that the units are connected in this way so that they can communicate correctly with each other.