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Realtime Tracking Accurate Position Magnetic Waterproof Remote Monitor 120 Days Long Standby Vehicle GPS Tracker Smart Saving Power Why does the device can't be on line ? 1) APN setting is wrong 2) GPRS is off ( the green light is off or solid on ) 3) IP and port was changed by somebody Working Mode:( Set it up on APP) SMS Track Time:about 100 days Sleep by time,use APP & PC:about 70 days Wake up by shock,use APP & PC:about 4-5 days Specifications: Net Weight: 300g Input: 5V-1A Output: 110-220V Network: GSM / GPRS GPS accuracy: 5m Standby Time: 120 days Size: 4.37 x 3.04 x 1.09 inches Lithium Battery: Rechargeable 3.7V 10000mAh Package Includes: 1 x GPS Tracker 1 x USB Cable 1 x Storage Bag 1 x User Manual Sim Card Choose: AT&T, AT&T2,TMobile etc. You can search SpeedTalk Mobile if you can`t find 2G GSM sim card. Or search: B01HE3V7UW directly.