The Speedlite 430EX III-RT supports optical and radio transmission for wireless flash shooting. With a flash effective range of guide number 43 (m/ISO 100), this speedlite also features a compact size, built- in catchlight panel, a dot-matrix LCD rear panel, and a wheel-type select dial for enhanced operability. With the bundled bounce adapter and colour filter, an even richer range of expression is possible. The settable bounce angle has coverage of up to 180° right and up to 150° left, providing it with increased flexibility. Can function as a master or slave flash unit and is able to control up to 15 slave units. It has a transmission distance of approx. 30m, which makes it possible for slave units to be positioned freely. Under optical transmission, it can also be used as a slave unit, within a transmission range of approx. 15m.