Achieve offline TTL, manual and strobe flash; S1, S2 light sensor flash mode; High performance, high compatibility, high power output; Wireless touch induction; Modes: TTL, Manual, Flash; Wireless slave function, the flash can be used to access the camera menu (Canon newer models); High-speed sync up to 1/8000 seconds; Rear-curtain sync with voice prompts, power saving mode, overheating protection function; With external power socket; Quick call back, call back the full light output only 2.9 seconds; Supports high-speed continuous shooting at 1/16 or less brightness, support 12 pieces / sec high-speed continuous shooting flash; Line Design: Automatic Insulated Gate Bipolar Transistor (IGBT); Flash index: 56 (ISO 100, 180 mm); Flash modes: Auto mode TTL, manual mode M, FEB (Flash Exposure Bracketing), slave mode Slave, lead flashing light mode S1, S2, strobe mode Multi; Wireless Trigger: Flash light sensor; Slave unit group: Four communication channels (3, 4) and the slave units 3 groups (A, B, C); Down angle: -7~90 degree; Left-right angles: 0~90 degree; Left-right rotate angles: 0~360 degree; Color temperature: 5500K; Flash time: 1/200~1/20000s; Flash control: 1/128~1/1 0.3EV, in total 22-level dimming modes; External interface: Hot shoe, PC interface, external charging port; Recycle time: 2.9 seconds; Wireless trigger distance: 10~30m.