Hahnel Modus 600RT MK2 Pro Kit with Viper TTL Transmitter for Sony (p/n 1005 252.0) Hahnel has introduced a compact yet powerful flashlight powered by an extreme lithium-ion battery for Sony cameras. It is incredibly intuitive to operate and boasts a range of advanced functions that make it simple to manage the quality and direction of light.It features a built in wireless receiver transmitter and supports optical wireless connection with other 3rd party flash units. This impressive digital flash is packed full of features and offers convenience and reliability just when you need it due to being powered by a high capacity Extreme Li-Ion battery rather than typical AA battery power. The Modus 600RT is capable of achieving 600 full power flashes but also up to 1000 flashes by running the speedlight at 1/2 power. This really is exceptional performance and shows that the Modus 600RT has both the speed and endurance the user needs. Its been built to appeal to the strobists who love to use lightweight flashguns to create sophisticated lighting set-ups and as such the Modus 600RT packs in the features. Functions include Master or Slave built in digital 2.4Ghz wireless its compatible with 3rd party as well as Hahnel triggers offers 1.5 sec recycle times Multi flash mode for strobe effects TTL full manual 1/8000 high-speed sync and USB for firmware updates. The newly introduced MK II version also features a quick-lock hot shoe system.