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GSM:MTK6223D GSM:Quad band 850/ 900/ 1800/ 1900 MHz GSM Antenna:Built-in quad band bracket antenna GPRS:Class12 GPS:MT3326 Frequency:L1, 1575.42MHz C/A code GPS Channels:20 Tracking Sensitivity:-159dBm Acquisition Sensitivity:-144dBm Locating time cost:Hot start :<2 sec(open sky) Warm start :<15 sec Cold start :<38 sec(open sky) GPS antenna:Built-in high gain ceramic Patch antenna Voltage input range:9-36vDC LED indicator:GPS-blue GSM-green Power-red Application environment:Operating temperature:-30℃to +80℃ Operating humidity:5% to 95% non-condensing Dimensions:90.0(L)× 45.0(W)× 13.6(H)mm Weight:45g Features: ● To operate with GPS/GSM/GPRS wireless network. ● Built-in high accuracy MTK GPS chips. ● Built-in GSM/GPS antennas. ● Check location information via SMS or GPRS (TCP). ● Real-time tracking. ● To start working automatically after connecting to power. ● Built-in monitoring CPU, eliminating breakdown automatically. ● Built-in ON/OFF power, wide voltage input range.