The Acute B is nothing less than a miracle. Weighing less than 5 kgs, it has a compact form (the size of a stack of VCR tapes) that incorporates a seven f-stop range from 9-600 Ws, 160 full power flashes per battery, and built-in wireless radio sync. With the Acute B Head, you can just put it all in a backpack and walk away, freely, carrying nothing short of an entire studio on your back. The bottom line- that you can - and will - carry high-quality lighting with you wherever you may go. The Acute B uses the latest sealed lead/acid technology batteries, combining maximum capacity with fast recharging and lastly, but certainly not the least, penalty-free partial charging. Additional battery cassettes for rapid replacement ensure that you are never out of power, no matter how far away from an outlet you may be.