The TK109 represents the perfect combination of GSM and GPS technologies, this model expresses advanced technology with its precise dimensions and compact appearance. It is a typical design of communication products and GPS services; Based on GPS satellites and under dynamic conditions, it can provide precise and accurate location information, with such characteristics, it can be used to protect and search for people. As a professional in security and positioning, it provides more and better products and services. Before using the watch, please read the user manual to learn details of the operations and obtain better services.