Flash Max energy 76 Ws Energy range 9 f-stops (0.1-76 Ws) Energy control increments 0.1 f-stops Recycling time 0.05-1.0 s Energy stability <0.2 f-stop Flash duration t0.1 No data Flash duration t0.5 No data Color temperature No data F-stop @ 2m / 100 ISO No data Wireless connectivity Built-in connectivity Profoto AirX Frequency band 2,4 GHz Supported Air functions Sync, TTL, HSS and remote control* (*can be used as both receiver and transmitter) Number of Air channels 20 (1-20) Number of groups per Air Channel 6 (TTL operation: 3 (A-C), Manual operation: 3 (D-F)) Wireless operating range 0.5-100 m (1.5-330 ft) with Profoto remotes* 0.1-30 m (0.3-90 ft) with Bluetooth devices *in optimal conditions up to 300 m (1000 ft) Supported apps for Bluetooth devices Profoto Camera and Profoto Control Synchronization and Control Profoto AirTTL Yes, built-in AirTTL receiver and transmitter Operation modes Auto/Manual Auto power off Yes, after 90 minutes of inactivity Profoto Air 2.4 GHZ Frequency Band 2.4 GHz (2404 to 2479.3 MHz) No. of frequency channels 20 (Ch. 1 to Ch. 20) Radio Power Output Maximum 19.9 dBm Range Up to 300m (1000 ft) for normal triggering (free line of sight in open space) . Up to 100 m (300 ft) for remote control and TTL Connectors Sync No Other USB Micro Powering Power supply A-Series Battery Mk II or A-Series Battery Battery capacity Up to 450 full power flashes Battery charger A-Series Battery Charger Battery charging time 115 min Other Firmware update via USB Micro or Bluetooth Photocell/IR-slave No Stand adapter No Umbrella mount No Operation temperature +10 °C to +35 °C (-10 °C to +50 °C with reduced performance). 50 °F to 95 °F (14 °F to 122 °F with reduced performance) Storage temperature Store in normal indoor conditions Measurements Width 7.5 cm / 2,95 in Length 16.5 cm / 6,37 in Height 10.8 cm / 4.25 in Weight 560 g / 1.2 Ibs (including battery)