ProFoto B2 250 AirTTL w/o battery

250Ws, Built-in AirTTL without Battery Optional Air Remote TTL for Canon, Nikon High Speed Sync and Freeze Mode 2 Asymmetrical Outlets 9 Stop Power Range: 1-250Ws Uses Removable Li-Ion Battery Up to 215 Full-Power Flashes Short Recycling Time 0.03-1.35 Second Flash Duration: 1/1,000 – 1/15,000 Sec. Weighs 2.2 lb with Optional Battery