The Flashpoint Zoom Li-on R2 DSLR TTL Flash for Sony V2 represents a significant breakthrough in photography speedlight power technology with the introduction of full R2 Remote TTL connectivity and interaction with all Nikon strobe functions. From standard TTL, to Exposure Compensation (FEC), FV Lock, High Speed Sync, and an automatically zooming flashhead, all the way to complete TTL control connectivity with other Sony flashes, group control, Slave and Master options, and advanced flash functions, the Zoom Li-on camera flash kit takes you as far as you want to go. The R2 TTL Wireless Flash System is the advanced 2.4GHz radio remote that adds camera TTL flash dedicated custom functions to your multi flash experience. Easy to use buttons command a full range of functions like reliable channel triggering, group mode selectivity, HSS, with powerful signal strength and exceptional stability to your selected camera flash language. The LCD panel clearly display the status of all remote R2 compliant strobes so you always have control of group lighting setup. R2 wireless communication gives speed of light response to on camera or off camera R2 family devices for a spectacular advantage on the shoot in any environment. The other massive advantage is the internal and interchangeable Lithium Ion Polymer battery with exponentially more power than AA batteries of any type, while fitting into roughly the same amount of space. Packing an amazing 11.1 volts and 2000mAh, this battery can power your flash longer and with faster recycle than any shoe mount speedlight on the market. Full power recycle times are less than 1.5 seconds, even if you fire 5 full power shots in fast succession! One completely charged battery can deliver up to 650 of those full power shots. Even in iTTL mode, you can try to drain the battery, but the Zoom Li-on keeps on going strong .