Profoto continues to refine and surprise us with an enhanced version of the B1 battery-powered monolight, the B1X. The B1X 500 AirTTL 2-Light Location Kit includes two B1X flash heads with 80% brighter LED modeling lights and batteries with 50% greater capacity (325 full power flashes) and High-Speed Sync that's able to use the full 9-stop power range.