	These cameras included both folding SLRs and less expensive nonfolding models. They take the SX-70 film, a format with a ~3.1 x 3.1 in² (77 x 77 mm) square image area and a ~4.2 x 3.5 in² (108 x 88 mm²) total area, and a sensitivity around ISO 160. They come with a built-in 6-volt zinc chloride "PolaPulse" battery pack, replaced with a lithium-ion pack in Polaroid Original remakes.