The pocketwizard ttl 5 pack is the ideal start point to expand your lighting controlconsisting of a minitt1 transmitter 2 x flextt5 transceivers an ac3 zonecontroller and a g wiz uber bag the minitt1 transmitter can be used to trigger remote e ttl speedlites or studio flashes that have the flextt5 transceivers attached to them add the ac3 zonecontroller to the on camera minitt1 transceiver and create up to three zones of flash control in both ttl and manual mode the pocketwizard ttl 5 pac