The PTS Resources caliber Z2031 (Shandong Liaocheng Zhong Tai Watch Company?) is a 22 jewels automatic watch movement. This caliber is made in China. There is a similar caliber Z2032.
The Z2031 is a multi-function automatic movement with an open balance wheel at 6:00, second time zone (dual time) subdial at 9:00 and a day/night (sun/moon) indicator at 12:00. The dual time subdial is a true second time zone indicator and is set independently by turning the crown backwards in time setting mode.
The PTS caliber Z2031 features double barrels (two mainsprings). Although this is a feature used to get more power reserve out of a watch movement, PTS Resources does not list the power reserve in their tech information.