There are eight Bodhisattva (Enlightened being) who protect the 12 Chinese Horoscope signs, with each deity protecting one (or two) Zodiac animals. The patron Horoscope Guardian deity of the Rat is Avalokiteshvara (Guan Yin). Carrying your Guardian deity amulet card close to you not only protects you from harm, it is also believed to help remove obstacles in your path, bring good fortune, attract good health and expel disasters.
Avalokiteshvara, one of the more widely revered Boddhisattvas in Mahayana Buddhism embodies the compassion of all Buddhas. He is also known as One who sees/hears all or One who is sensitive to the sufferings of the world. He helps you to fulfil your dreams, and have a peaceful life free of spirit harm and hindrances.
The Dependent Arising mantra printed on the other side of the card is said to help actualize all your aspirations and wishes in life.