The Profoto B1x 500 Air TTL is a high powered, highly versatile monolight that supports TTL and HSS in a robust body with easy to use controls. With the provided Profoto Air Sync wireless triggers the units are quick to set up and have a range of approximately 300m. With the High Speed Sync (HSS) support you’re able to trigger the flash at shutter speeds faster than your cameras regular sync speed, helping to knock down the ambient light for outdoor shooting at shallow depths of field. There is two supplied batteries in the kit, each giving 325 flashes at full power and thousands at reduced power outputs. The LED modelling light also provides a high powered modelling lamp without draining much power.