TTL & Advanced Flash Functions: The Godox V1 U Speedlight fully supports TTL functions, including TTL Autoflash, Manual Flash, 1/8000s High-Speed Sync, Flash Exposure Compensation, Flash Exposure Lock, Second Curtain Sync, and Modeling Flash for versatile shooting control. | Round Flash Head for Soft, Even Lighting: The round flash head provides studio-quality, soft, and even light, ideal for portrait, wedding, event, travel, and still life photography. | Powerful & Efficient Battery: Equipped with a 7.2V/2600mAh battery, the V1 U offers 1.5-second recycling time, 480 full-power flashes, and a quick 3.5-hour recharge, with power settings adjustable from 1/256 to full power in 1/3 stop increments. Flash durations range from 1/300 to 1/20,000s (t0.1). | Built-in 2.4G Wireless X System: Offers seamless wireless integration with other Godox products, allowing remote control and triggering of the V1 U Flash Speedlite, ensuring great compatibility with various cameras and systems. | Detachable Plastic Rim & Optional Upgrades: The V1 U comes with a detachable plastic rim, allowing users to remove it and replace it with a standard universal metal rim as needed, offering a range of round light modifiers in the Godox AK-R1 Accessories Kit . The built-in LED modeling lamp is adjustable from 01 to 10 step.