Canon Speedlite 270EX II Instruction Manual page 27

Wireless Slave Function
Reception channel ........................... All channels
Reception angle ............................... Approx. ±45° horizontally and ±25° vertically, facing
Slave ID ........................................... Fixed to group A
AF-Assist Beam
Power Source
Battery.............................................. Two size-AA/LR6 alkaline batteries
Recycling time.................................. Approx. 0.1 - 3.9 sec. (Quick flash: approx. 0.1 - 2.6 sec.)
Battery life (flash count) ................... Approx. 100 - 680 flashes
Dimensions
(W x H x D)........... 65.8 x 65.2 x 77 mm / 2.6 x 2.6 x 3.0 in.
Weight
....................................... Approx. 155 g / 5.5 oz. (excluding batteries)
All specifications above are based on Canon's testing standards.
Product specifications and external appearance are subject to change without notice.
........ Optical pulse method
the master unit
....................... Intermittent flash firing
Effective range: Center: Approx. 4 m / 13.1 ft.,
Periphery: Approx. 3.5 m / 11.5 ft.
25