The Canon Speedlite EL-10 is suitable for mirrorless photographers eager to enter the broader world of flash photography. When mounted on compatible EOS R series camera bodies, the light can control up to 15 additional Speedlite units, opening the door to a brighter spectrum of creative possibilities. Realize the creative potential of flash photography with a combination of features in the EL-10. Maximum guide number of 131' at ISO 100 and 200mm, Runs on AA batteries, available separately, Up to 210 full-power flashes on a single charge, Able to continuously trigger up to 55 flashes in a row. The EL-10 is ideal for users who want to move beyond the basic flash unit and exert more control over variables like output, direction, and quality.  2.4 GHZ wireless radio transmission as sender or receiver for wireless triggering and control of up to 15 flash units from up to 98' away. Multi-function shoe enables direct control of settings from compatible cameras. Control settings with your smartphone using the Canon Camera Connect app.