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. Also included are an AC battery charger, a car charger, and a Backpack M to store and transport it all. All of the familiar professional and convenience features we've come to expect from Profoto are onboard. The B1X has the same dense, durable polymer housing, integrated 77-degree reflector, built-in receiver compatible with Air Remote TTL remotes, and intuitive highly visible controls and display.