YN-B1800 lithium battery power supply, 1.5 seconds speed return; long battery life, light output up to 700. New upgraded radio master/slave function: TTL and high-speed synchronization are added on the basis of YN560TX; the protocol is cross-brand compatible; the receiver of the original YN622 protocol can receive the main control signal of YN862C/YN560TX Pro after upgrading the firmware. Support TTL/M/Multi/Gr flash mode, front curtain/rear curtain/high speed sync, exposure compensation/surround/lock, focus control, radio master/slave and other functions. Fine dot matrix LCD display, new quick operation interface. Flash stability has increased dramatically. Support for USB firmware upgrades. Specifications: Circuit design:Insulated Gate Bipolar Transistor (IGBT) Guide No.:60 (ISO 100,200mm) Flash mode:ETTL, M, Multi,Gr Trigger mode:Set-top mode, radio wireless master mode, radio wireless slave mode, optical slave mode,S1,S2 Zoom:Auto,20,24,28,35,50,70,80,105,135,200mm Vertical rotati