Shanny SN600EX-RF Speedlite ,build-in 2.4G wireless radio master and slave flash ,GN60,on-camera TTL,HSS 1/8000s for Canon Wireless Flash: 2.4G radio wireless ETTL master unit,slave unit Compatible with SN600C-RF ,constitute to Shanny 2.4G radio wireless flash system Guide Number: GN60(ISO100,200mm),High-speed sync: 1/8000s Flash mode: ETTL/M/Multi Trigger mode: On-camera flash, 2.4G RF wireless trigger, Light trigger S1,S2