The newest addition to the Pro-Flash line the TLi is the worlds first Lithium-Ion powered speedlight with TTL No more fumbling with a pocket full of AA batteries the TLi features an exchangeable Li-Ion battery for easy & inexpensive battery management. With a 1. 5 second full-power recycle time & 650 full-power flashes per charge the TLi is always ready for you when you need it most. & with advanced TTL High Speed Sync & Remote Triggering functions the TLi gives you the same performance youve come to expect from the leading speedlights on the market The Pro-Flash TLi-C is designed to work flawlessly with the latest Canon DSLR cameras & flashes featuring TTL functionality that is compatible with Canons E-TTL system Flash Exposure Compensation Flash Exposure Bracketing & Flash Exposure Lock. The TLi-C can also be used in conjunction with the Canon 600EX-RT & 580EX-II as an Optical Master or Slave flash making it an easy addition to your existing speedlight set-up. For those already using the Pro-Flash One Eighty or Pro-Flash 360 the TLi-C is designed to work in perfect harmony with the remote triggering system. When used off-camera the TLi-C can be controlled by the same Strobies Pro-Flash Remote that is used to control the other Pro-Flash units Sold Separatelystrong Compatible Camerasstrong Canon EOS cameras with E-TTLII auto flash capabilities- 5D Mark III 5D Mark II 6D 7D 60D 50D 40D 30D 650D 600D 550D 450D 400D Digital 1100D 1000 Dstrong Compatible Speedlightsstrong For use as wireless Master or Slave flash- 600EX-RT 580EXII