Features -Studio Quality Lighting AD360-360WS and GN80 (m ISO 100, with standard reflector). Bare bulb - providing even and sufficient illumination. Better quality of light provided by flash tube and parabolic reflector. -Multiple Functions S1/S2 slave triggering, Multi flash, hi-speed sync (up to 1/8000s). Multiple camera-flash sync ways: hotshoe, 3.5mm PC sync socket, S1/S2 slave triggering, wireless control port. Color temperature ranges within 5600200K. Flash control: adjusting from full power from 1/128 to 1/1 in 1/3 stop increments, 22 levels of the fine turning. Over Temperature Protection: To avoid overheating and deterioration the flash head, do not fire more than 75 continuous flashes in fast succession at 1/1 full power. If you fire more than 75 continuous flashes and then fire more flashes in short intervals, the inner over-temperature protection function may be activated and make the recycling time about 10-15 seconds. If this occurs, allow rest time of about 10 minutes, and the flash unit will then return to normal. -Wireless Remote Power Control Optional FT-16(SKU: D1299) can wirelessly adjust WITSTRO flash power levels, control focus assist beam and sound beep, and wirelessly trigger flash. -Professional Power Pack Use lithium battery pack (11.1V/4500mAh). Dual outputs for powering two separate flashes without reducing recycle time. Optimized MCU circuit design, more efficient energy conversion and more flashes. Power Pack offersAD360 separately 450 times full power flashes. AD360 recycles time in 0.05-4.5 seconds with power pack.