Flashpoint Zoom Li-on Manual Flash with Integrated R2 Radio Transceiver The Flashpoint Zoom Li-on R2 Flash represents a significant new version breakthrough in speedlight power technology with the introduction of full R2 Remote Manual connectivity and interaction with all strobe functions. From standard manual power levels, to complete control connectivity with other R2 family flashes, group control, Slave and Master options, and advanced flash functions, the Zoom Li-on flash takes you as far as you want to go. 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. Besides Manual control, there are 2 optical slave modes, and a stroboscopic mode as well. The metal shoe features a locking pin, so even if the foot is not tightened properly it will not accidentally fall off of the camera or mount. Remote power control using a Flashpoint R2 System Transmitter or R2 Family flash allows you to view and change your flash output as you shoot as well, trigger the fl