Hinge

A hinge, comprising:

• a first shaft and a second shaft;
• the first shaft perpendicularly mounted to the second shaft;
• the second shaft comprising an end face, the end face defining a recess and two positioning holes, the recess defines two barrier sides;
• a first bracket pivotally mounted to the first shaft and being capable of rotating about the first shaft;
• and
• a second bracket pivotally mounted to the second shaft and capable of rotating about the second shaft;
• the second bracket comprising a guiding piece capable of sliding in the recess when the second bracket rotates about the second shaft;
• wherein the second bracket is rotatable about the second shaft between a first position and a second position;
• in the first position, the guiding piece abuts one barrier side, the protrusion is located in one positioning hole;
• in the second position, the guiding piece abuts the other barrier side, and the protrusion is located in the other positioning hole.