Flashpoint R2 Bridge Receiver for Non-R2 Zoom Li-on Speedlights (XTR16s) Flashpoint R2 Receiver for Non-R2 Zoom Li-on Speedlights R2 Radio Remote Upgrade to Zoom Li-ons Adds full R2 Remote TTL to TTL Zoom Li-on speedlights 16 Group and Channel selectivity Powers off of flash