A mini-monolight a tad larger than a soda can and no calories! Featherweight 18.5 Ounces of portable champ power Complete Wireless R2 Radio performance response Great way to start an R2 Flash Family on a budget 100WS of in the most well thought out design Ready for shot after shot with 0.01 f 1.5 Second Recycle Time Reliable and brilliant Flashpoint R2 2.4GHz Radio System Auto-Sensing Radio Slave Modes for Canon, Sony, Nikon, Fuji, Pentax, Panasonic, and Olympus 328 feet / 100 meter R2 signal reception range Rear port interchangeable 7.2V / 2600mAh Lithium-ion Battery Uses the same battery module as the Zoom Li-on X and Zoom Li-on III Magnetic round flash head rim holds a treasury of light modifiers Manual Flash range over 9 Stops: 1/256 - 1/1 Output (1/3rd or 1/10th Increments) Flash Modes - TTL / M / Multi 5 Groups keep the pace and the peace - A / B / C / D / E 32 Channels protect the isolation of the signal High Speed Sync to 1/8000th second