The Elinchrom ELB 1200 Battery Power Pack With Battery measures at 6.4 x 7.12 x 3.6″ and weighs 5.5 lb with the battery. It’s perfect for travel and location photographers shooting fashion, portraits, or editorial. It pairs well with an optional Elinchrom Skyport Pro or Phottix Odin II transmitter. The ELB 500 TTL greatly reduces setup delays, shortening the time between inspiration and execution by using your camera’s flash exposure system.With asymmetrical power distribution over 7 stops to 2 ELB flash heads, photographers can make TTL power adjustments at distances from 328 to 656′ depending on the transmitter they use. There’s also a Manual Lock mode that allows you to get a TTL initial exposure “lock\