The Most Versatile PocketWizard Radio Ever. The FlexTT5 Transceiver maximizes both E-TTL II and Manual Remote Control capability of Canon photographic equipment by greatly expanding their operating environment. Lock your flash into the FlexTT5 built-in hot shoe, turn it on and you are ready to shoot. With 32 standard triggering channels, 20 E-TTL II channels and Multi-zone capability, it's the perfect MultiMAX partner. But wait, there's more.