Security and safety is an essential feature for this product.Hence, it is extremely critical to ensure the unit is able to make the SOS call and send the timely and accurate GPS location to the dedicated party. . The GPS tracker shall be able to send GPS location, making emergency voice call by pressing SOS button. In order to provide quick and accurate GPS location, cell ID and AGPS technology is incorporated in this device. The data (GPS location, remaining battery capacity etc.) shall be sent by both GPRS and SMS (the choice will be determined in the detail logic flow and MMI document). GSM frequency. Quad band 850/900/1800/1900. GPRS type – Class 10, TCP/IP build in GPS sensitivity - 159 dBm