The Yongnuo YN560 IV is the world's best-selling budget manual speedlite. It combines a solid GN58 (ISO 100 · 105mm) output with a built-in 2.4G radio that works as both a transmitter and receiver — control other YN560-series flashes right from the unit, or fire it from a YN560-TX / RF-603 / RF-605 trigger.
