Built-in EL-Skyport receiver for triggering. EL-Skyport with 8 Frequency Channels with 4 Groups. EL-Skyport Speed Sync mode for synchronization up to a 1/320 s on enabled SLR cameras. Pre-flash detector system to enable the use of FRX with speedlights. Visual Flash Confirmation option. The modelling lamp comes on to confirm the flash has been triggered. Proportional, maximum, minimum and independent adjustment of the modelling lamp. Variable f-stop steps: 1/1, 5/10, 4/10, 3/10, 2/10 or 1/10 steps are available. Programmable ready beep function. Power Auto-dump. Automatic temperature controlled ventilation. Action flashtube for sharper images. Multi-voltage auto-detection: 90-270 V (excluding modelling lamp). 5V sync socket for maximum protection of digital cameras. High impact resistant body shell. Accessory bayonet allowing the complete range of light modifiers. Rubberised handgrip with built-in fuse storage.