1. 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 power back completely output the power back only 2.9 seconds; Supports high-speed continuous shooting at 1/16 or less brightness support 12 pieces / sec high-speed continuous shooting flash; 2. Line Design: Automatic Insulated Gate Bipolar Transistor (IGBT); 3. Flash index: 56 (ISO 100180 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; 4. Wireless Trigger: Flash light sensor; 5. Slave unit group: Four communication channels (3 4) and the slave units 3 groups (A B C); 6. Down angle: -7~90 degree; Left-right angles: 0~180 degree 7. Color temperature: 5500K; 8. Flash time: 1/200~1/20000s; 9. Flash control: 1/128~1/1 0.3EV in total 22-level dimming modes; 10. External interface: Hot shoe PC interface external charging port; 11. Recycle time: 2.9 seconds; 12. Down rotate angles: 0~90 degree Left-right rotate angles: 0~360 degree; 13. Wireless trigger distance: 10~30m.