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Instructions - Umpire + Coach Radios (4-way)
Reset pairings for both Coach (V4) radios
Press and hold the INTERPHONE/ON button until the LED turns on.  Press and hold both A and B buttons together until the LED flashes red before switching back to flashing blue.

Pair first Coach (V4) radio with first Umpire (V6) radio
Press and hold button A on the Coach (V4) radio whilst at the same time press and hold the INTERPHONE button on the Umpire (V6) radio until the LED on both units are flashing red and blue continuously.
Press button A on the Coach (V4) radio - the LED on the V4 radio will flash blue as it seeks to pair with the V6 radio.  When the units have paired, both units will flash blue.  When this occurs, briefly press button A on the Coach (V4) radio to switch to talk mode.
Pair second Coach radio with second Umpire radio
Repeat process in Step 2 but using the other Coach and Umpire radios

Pair the Coach radios
Press and hold button B on the first V4 unit until the LED flashes red/blue.  Then press and hold button B on the second V4 unit until the LED flashes red/blue.  Press button B on the first V4 unit - the LED on the V4 unit will flash blue as it seeks to pair.  When the units have paired, both units will flash blue.  When this occurs, briefly press button B on the V4 unit to switch to talk mode.
Enable 4-way communication
Press (and release) the A button on the first Coach (V4) radio. Pause and then press the A button on the second Coach (V4) radio.
Four-way communication should now be enabled.