Second Curtain Sync 300ws in the most well thought out design Ready for shot after shot with 0.01 - 1.5 Second Recycle Time Reliable and brilliant Flashpoint R2 2.4GHz Radio System Auto-Sensing and Switching Radio Slave Modes for Canon, Sony, Nikon, Fuji, Pentax and Panasonic/Olympus M4/3 328 feet / 100 meter R2 signal reception range Rear port interchangeable 14.4V / 2600mAh Lithium-ion Battery Manual Flash over 9 Stops: 1/256 - 1/1 Output (1/3rd or 1/10th Increments) Flash Modes - TTL / M / Multie 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 Advanced IGBT circuitry for stable and precise flash duration Last Shot Auto Memory Function FEC / FEB - 1/3rd Increments (½3 Stops) FEL (Flash Exposure Lock) S1 Standard & S2 'Smart' Optical Slave Modes Professional balanced Color Temperature at 5600½K ½ 200½K