Elinchrom EL 20461.1 Style 500 BXRi Multi-Voltage Compact Flash Unit Built-in Skyport Triggering  Using a Skyport Trigger can completely control the BXRi including power up and down and turning on/off modeling light using eight frequencies and four workgroups. Visual Flash Confirmation  Modeling light can turn off until flash is ready to fire. Eye-Cell  When using BXRis in optical slave mode with cameras or pocket flashes with a pre-flash, user can program the number of pre-flashes or have the head automatically program on its own. Power & Modeling Lamp Steps  Can modify 1/10 step increments to any 1/20, 1/30,  1/90, 1 stop. Change ready beep sound length - The length of the ready beep can be changed from 70 to 4910 m/seconds.