Flash Output. The Profoto B10X OCF Flash Head offers a 250Ws maximum output, with 10 stops of adjustment in 1/10 or 1-stop increments. Maximum recycle time at full power is 1.3 seconds, and a Freeze Mode allows you to prioritize flash durations as short as 1/19,000 of a second. All of this in a package roughly the size of a Canon 70-200mm f/2.8L IS III. For a version of this strobe with a faster freeze mode, check out the B20.

LED Modeling Light. The built-in modeling LED provides the equivalent of 150W incandescent light. It’s dimmable and boasts a 3000/6500K bi-color temperature and a CRI of 90-96, which makes it great for video.

Supports All TTL Air Remotes. The B10X OCF offers full TTL support when matched with one of the Profoto Air Remote TTL Transceivers for Canon, Nikon, Sony, Fuji, and Olympus. Please note that these are separate rental items.

Triggering Options. This strobe has a built-in Profoto AirX radio receiver, allowing it to be triggered by any of the TTL remotes above. You can also use the Profoto Air Remote Transceiver if you’re comfortable with manual power adjustment. You’ll get 300 feet of range when triggering in TTL mode, and up to 1,000 feet with normal radio triggering. Additionally, there’s a built-in optical secondary flash. Unfortunately there’s no external sync port.

Battery Power. The included lithium-ion battery provides about 400 full-power flashes per charge, or up to thousands of flashes when you lower the power output. The battery attaches to the side of the strobe housing itself, making it easy to move around with. The strobe cannot be AC powered, so once the battery is depleted you’ll need to recharge or swap batteries before you can continue shooting.