Interfit S1 500Ws HSS TTL AC and Battery-Powered Off-Camera Flash, Color Accurate 5700K +/- 100K, High Speed Sync to 1/8000s, Includes AC Power Pack and Removable Inline Lithium Ion Battery Comes Complete with International Multi-Voltage AC Power Adapter and Removable Inline Lithium Ion Battery - get studio and on-location functionality at the time of purchase: no need for expensive accessory addons, it's all included in the price and offers extreme power flexibility. An industry-leading battery life of 350 Full Power 500 Ws flashes per charge ensures uninterrupted photoshoots. High speed sync to 1/8000th of a second when used with the Interfit S1 remote allows for balancing and cutting ambient light in the background as well as the use of wide apertures such as f/1.2. 5700K color temperature with an industry-leading and extremely consistent 100K throughout the entire range minimizes color correction time in post-production. Mount is compatible with a large scope of adapter rings and modifiers such as softboxes, reflectors, and grids,500Ws monolight with HSS and TTL for Canon, Nikon, and Sony.