Universal Test Cage, model HH-A-2-13 is manufactured by Suzhou Houzhuang Animal Equipment Technology Co., Ltd. It consists of a test cage and two control cages. The window on the cage has multiple horizontal bars. When the experimental animal is placed in the control cage, it can observe the objects in the test cage through the window. The test and control cages were connected via door latches. The test cage has a door made of transparent PC material. The lifting and lowering of the door is controlled by a set of stainless steel pulleys, thereby controlling whether the experimental animals can observe the objects in the test cage. Experimental operators can observe various behaviors of experimental animals in the cage unilaterally through the windows of the test cage.