1、Powerful function. Support TTL flash, manual flash, strobe flash, 1/8000s high-speed sync, front-curtain sync, and rear-curtain sync. 2、2.4GHz frequency, effective trigger distance of about 25m/82ft, ans it can be used as as both main light and slave light, supporting for three groups of A/B/C and 4 channels. 3、With an AF assist lamp, which increases the likelihood of successful focusing in low light or low contrast conditions. When it is difficult to focus, the red focus light will automatically on to help autofocus. 4、Flash coverage can be set to auto zoom and manual zoom, which ranges from 24 to 105 mm. Built-in wide-angle diffuser enables flash shooting with ultra-wide-angle lenses up to 14 mm wide. 5、Flash output power range from 1/1 to 1/128, color temperature of 5600k ± 200K, widely applicable to portrait photography, wedding photography, event photography, travel photography, still life photography, etc. Item Type: Camera Flash Condition: 100% brand new Material: ABS Model: VS-765 Compatible Camera Models: 1D3/1D4/1DX/450D/ 5D2/5D3/5D4/5DS/ 6D/6D2/600D/7D/ 7D2/70D/700D/750D /80D/800D/1500D/200D Flash Index: About 58 (105mm/4.1in coverage range, ISO100, in meters) Color Temperature: 5600±200K Flash Coverage: 24-105mm (14mm when using a diffuser). Autofocus (automatically set the flash coverage based on shooting angle of view and image sensor size) Reflection Angle: Manual focus 90° upwards, 7° downwards, left/right 180° Flash Duration: 1/10000s Exposure Control System: TTL auto flash, manual flash, strobe Flash Exposure Compensation (FEC): ±3 levels in 1/3 increment Sync Mode: High-speed sync (up to 1/8000 seconds), front-curtain sync, rear-curtain sync Manual Flash: 1/128-1/1 (adjusted in 1/3 increment) Stroboscopic Flash: Up to 50 times, 100Hz Recycle Time: About 3 seconds Wireless Function: Master unit, slave unit Controllable Slave Unit Group: A / B / C Effective Trigger Distance: Approx. 25m/82ft Channels: 1-4 Slave Unit Status Indicator: Two red lights on at the same time Battery: 4 x AA batteries (NOT included) Battery Life: About 200 flashes at full power Power Saving Mode: When used as the main light, the flash will be off after 90 seconds of unmanned operation; when used as slave unit, it enters the sleep state after 60 minutes. Product Size: Approx. 61x75x190mm/2.4x3.0x7.5in 1 x Camera Flash 1 x Base 1 x Portable Bag 1 x User Manual