Wireless flash unit for mirrorless Sony cameras. TTL, M, Multi, and Group flash modes. Integrated transceiver and receiver. Fast 2-second flash recycle time. Guide number: 60. Can be used as a master or slave unit. Wireless transmission range up to 100 meters. Includes 1x Yongnuo YN685EX-RF, 1x mini stand, 1x case. Compatible with YONGNUO RF wireless triggering system (RF602/603). The YN685EX-RF can be used as a master or slave unit for wireless flash triggering and is fully compatible with the wireless triggering signals of YN650EX-RF, YN685EX-RF, YN320EX, YN685(II), YN720, YN560 IV, YN660, YN560 III, YN560-TX (pro), RF603, RF602, and YN32-TX. It also features 16 transmission channels and 10,000 wireless IDs, making it easy for multi-flash lighting. Supports independent control of multi-group flashes. When the YN685EX-RF is used as a wireless master unit, it can control 5 independent groups and allows remote control of flash mode, flash power, and focal length for YN650EX-RF, YN685EX-RF, YN320EX, YN685(II), YN720, YN560 IV, YN660, and YN560 III. Firmware update. The product is equipped with a USB port. You can download the latest firmware to update the product. Real-time power consumption display. With the real-time battery power display, it is easy to determine power consumption. TTL flash unit for optimal lighting. The flash unit ensures optimal lighting of your subject, even in challenging lighting conditions. The TTL flash automation (Through the Lens) measures through the lens how much light is needed and adjusts the intensity of the flash accordingly. No manual adjustments are necessary; the required amount of light is automatically adapted to the respective conditions. If needed, you can also control the flash manually.