In radio-controlled Advanced Wireless Lighting ("radio AWL"), the camera controls remote flash units with radio signals transmitted via a WR‑R10 wireless remote controller attached to the camera.
Radio AWL can be used in situations not suited to optical flash control, such as the three listed below.
Radio AWL can be used for reliable communication with flash units up to about 30 m (98 ft) from the camera.
Radio flash control can be used with flash units that cannot be seen from the camera, giving you greater freedom in placing remote flash units.
Bright ambient lighting interferes with the optical signals used for optical flash control. Radio AWL provides reliable flash control even in bright sunlight.