In addition to being powered by the high voltage TR-PAKIIa NiCd power pack, which provides 200 full-power flashes at an impressive recycle rate of 1.5 seconds, other power sources are also available, including an AC adapter. The 120J TTL can even operate with just 4 AA batteries installed, when greater capacity or faster recycling are not needed.
When TTL flash dedication is either not available or desired, the 120JTTL and its identical non-TTL version the 120J Auto, both offer 3 aperture settings, plus manual adjustment (full, 1/2, 1/4, 1/8, 1/16 power) for total creative control. The parabolic reflector can be positioned for normal and wide angle use, or removed for bare bulb lighting that creates a uniquely natural lighting effect.