XPLOR 400 Pro Compact TTL R2 Monolight 400ws in the most well thought out design Solid Guide Number of 236' (72m) (ISO 100, included reflector) Ready for shot after shot with 0.01 - 1 Second Recycle Time Reliable and brilliant Flashpoint R2 2.4GHz Radio System Auto-Sensing and Switching Radio Slave Modes for Canon, Nikon. Sony, Fuji, and Panasonic/Olympus M4/3 328' (100m) R2 signal reception range Up to 390 Full Power Flashes Per Battery Charge Rear latching interchangeable 21.6V / 2600mAh Lithium-ion Battery Manual Flash over 9 Stops: 1/256 - 1/1 Output (1/3rd 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 Advanced IGBT circuitry for stable and precise flash duration Last Shot Auto Memory Function Second Curtain Sync FEC / FEB - 1/3rd Increments (3 Stops) FEL (Flash Exposure Lock) 99 Wireless ID's for ultimate security