A positioning module is arranged on an electronic ring. The electronic ring has an outer ring surface. The positioning module has at least a part of the inner surface surrounding the outer ring surface. The inner surface has at least one clamping part and the outer ring surface of the electronic ring is concave and convexly matched. Therefore, when the positioning module itself is improved, the installation structure between the positioning module and the electronic ring will not be affected, and the cost of replacement can be reduced.一種定位模組，設置於電子環，電子環具有外環表面，定位模組具有內側面環繞外環表面的至少一部分，內側面具有至少一卡接部和電子環外環表面凹凸配合。因此，針對定位模組本身進行改良時，不會影響定位模組與電子環之間的安裝結構，可以減少汰換時的成本。
