Feature:1. Supports Nikon Optical Transmission Wireless Slave Flash: One YN565EX III can respectively accept the master unit of YN600EX-RT II、YN568EX II、YN568EX III、600EX(II)-RT、580EX II、SB910/900/800/700, Nikon built-in flash C command, realizes external TTL and manual flash and stroboscopic flash.2. Ultrafast Charging Recycle System: it takes just 2 seconds for the flash to finish charging recycle, and it could use the external battery pack to accelerate the charding recycle time.3. TTL Flash with High Guide Number: GN58@ISO100, 105mm, supports TTL, M, MULTI flash mode; equipped with AF assist lamp for helping you achieve fast focus in dark environment.4. Supports Firmware Upgrade: equipped with the USB interface, you can download the latest firmware from YONGNUO official website to upgrade the speedlite.5. Other users-friendly functions: Sound Prompt System; supports real-time display of battery remaining capacity; automatic settings saving; Large-size LCD display and standard 2.5mm PC interface.Specification:Features:Supports Nikon Optical Transmission Wireless Slave Flash:One YN565EX III can respectively accept the master unit of YN600EX-RT II、YN568EX II、YN568EX III、600EX(II)-RT、580EX II、SB910/900/800/700, Nikon built-in flash C command, realizes external TTL and manual flash and stroboscopic flash.Ultrafast Charging Recycle System:it takes just 2 seconds for the flash to finish charging recycle, and it could use the external battery pack to accelerate the charging recycle time.TTL Flash with High Guide Number:GN58@ISO100, 105mm, supports TTL, M, MULTI flash mode; equipped with AF assist lamp for helping you achieve fast focus in dark environment.Supports Firmware Upgrade:equipped with the USB interface, you can download the latest firmware from YONGNUO official website to upgrade the speedlite.Other users-friendly functions:Sound Prompt System; supports real-time display of battery remaining capacity; automatic settings saving; Large-size LCD display and standard 2.5mm PC interface.Specifications:Circuit design: Insulated Gate Bipolar Transistor (IGBT)Guide No.: 58 (ISO 100, 105mm)Flash mode: TTL, M, MultiTrigger mode: Set-top, Sc, Sn, S1, S2Zoom Range: 24, 28, 35, 50, 70, 80, 105mmVertical rotation angle: -7~90 degreesHorizontal rotation angle: 0~270 degreesPower supply: 4 * AA batteries(not included; Alkaline or NI-MH are usable)Lighting times: 100~1500 times (with AA alkaline battery)Recycle time: Approx. 2s (with new AA alkaline battery)Color temperature: 5600kFlash time: 1/200s~1/20000sFlash control: 8 levels of output control (1/128~1/1), 22 levels of fine tuning in totalExternal interface: hot shoe, PC port, USB port, external charging portExternal Power Supply: can be connected to SF-18C or SF-17C charging packWireless triggering distance: 20~25m indoors, 10~15m outdoorsAdditional features: Rear-curtain sync, FEC, FEB, exposure lock, modeling light, power saving mode, over heat conservation.Item Size: 6 * 7.8 * 19cm/ 2.4 * 3.1 * 7.5in(Extended state)Item weight: 370g / 13.1ozPackage size: 21.5 * 9.5 * 8cm / 8.5 * 3.7 * 3.1inPackage weight: 550g / 19.4ozPackage list:1 * Speedlite1 * Mini Stand1 * Protecting Bag1 * User Manual(English & Chinese)Package List:1 * Speedlite1 * Mini Stand1 * Protecting Bag1 * User Manual(English & Chinese)