Features Compatible with YN622C and YN560 wireless system: When YN968C is used as a master unit, it can control and power on YN968C/YN622C(II)/YN685C as a slave unit. When YN968C is set to YN622 (slave mode), it can receive control signal or trigger signal from YN968C/YN622C(II)/YN622C-TX main unit, and realize slave flash in TTL/M/ Multi. When YN968C is set to YN560 (slave mode), it can receive the command signal or trigger signal from YN560-TX(II)/RF603(II)/RF605, and realize flash in M/Multi mode. High Guide Number, support high-speed sync:GN60@ISO100,200mm, support TTL high-speed sync, manual flash, multi-flash, Gr grouping flash, the highest synchronous speed can reach 1/8000s . Equipped with LED light: Equipped with high-power high-power LED light, the brightness can be adjusted, there is a built-in diffuser and color conversion filter for the LED light. Support USB firmware upgrade: The YN968C equipped with USB interface, support firmware upgrade, users can download upgrade firmware through Yongnuo official website to upgrade the flash. Support auto/manual zoom and wireless optical slave function: Support auto and manual zoom, flash coverage can be changed between auto, 20~200mm; Support YONGNUO receiving, for canon and nikon optical wireless main signal, support S1 and s2 flash mode. Specifications: Brand: YONGNUO Model: YN968C Circuit Design: Insulated Gate Bipolar Transistor (IGBT) Guide No.: 60 (ISO 100, 200mm) Flash Mode: TTL, M, Multi, Gr Trigger Mode: Decoder, Master mode without radio wire (YN622), radio wireless slave mode (YN622/YN560), wireless optical slave mode (C/N slave, S1, S2) Zoom: Auto, 20, 24, 28, 35, 50, 70, 80, 105, 200 Vertical Rotation Angle: -7 ~ 150 degrees Horizontal Rotation Angle: 0 ~ 360 degrees Power Supply: 4 x AA size batteries (Alkaline or Ni-MH batteries) Lighting time: 100 to 1500 times (AA alkaline battery used) Recycling time: approx. 3s (AA alkaline battery used) Flash color temperature: 5600K Flash time: 1/200s ~ 1/20000s Flash control: 8 levels output control (1/128 ~ 1/1), 29 levels fine adjustment External interface: Hot shoe, PC port LED color temperature: approx. 5500K LED Luminance: Approx. 300lux (1m) Optical Transmission Triggering Distance: 20~25m indoor, 10~15m outdoor Radio Transmission Triggering Distance: up to 100m Additional Features: Master Flash, High Speed Sync, Second Curtain Sync , FEC, FEB, FEL, electronic flash head zoom, sound prompt, auto record setting, PC port, power saving mode, overheat protection, custom functions (C. Fn) Item: (extended state) 7.8*6.05*20.6cm / 3.1*2.4*8.1in Item weight: 435g / 15.3oz Package size: 22*10*9cm / 8.7*3.9*3.5in Package weight: 621g / 21.9oz Note: Batteries are not included. Package List: 1* Speedlite 1* Mini Bracket 1* LED Light Color Conversion Filter 1* Protective Bag 1* User Manual (English and Chinese)