broncolor Siros 400 L Wi Fi / RFS2.1 Outdoor Twin Head Kit 2 The Siros L is broncolor’s new battery-powered compact device, which provides ambitious professional photographers with the opportunity to enjoy the perfect lighting, be this in a mobile form in the studio, or for external shots – offering up to 440 flashes at full power per battery charge, colour constancy & both very fast, & also long, flash durations. Easy to control with the bron Control App. Available in 400 & 800 Joules.