Cordless, battery-powered off-camera flash with TTL. The integrated and patent pending AirTTL technology takes the concept of ?point and shoot? to the next level and also allows wireless sync and remote control with any optional Profoto Air transceiver. Powerful output adjustable in 1/10 f-stop increments over a 9 f-stop power range. Bright auto-proportional LED modeling light. An exchangeable, integrated Lithium-Ion battery provides up to 220 full-power flashes per charge. It is also fast. At lower power settings, the B1 will produce up to 20 flashes per second. Has a built in reflector and umbrella holder. Compatible with more than 120 Light Shaping Tools.