Long Standby Time: It has built-in 3.7V 7800mAh Li-ion battery, can standby up to 120 days Remotely Voice Monitor: Send "Monitor+Password" to the device first, then the device will turn into monitor mode, now if you make call to the SIM number in the device, it will pick up your call automatically and you can monitor the voice around the device Overspeed Alarm: This alarm works only under continuous positioning mode.When the unit speed is exceed the speed you presetted, it will send message “speed alarm!” to the admin number every 5 minutes Shake Alarm: After you did the shake alarm setting,please keep the tracker being stationary for 5 minutes, then this function will start working. It will send SMS “sensor alarm!” to the admin number when the unit get shocked Sleep Mode: Sleep by time mode: After did this setting, tracker will only work for 5 minutes after being waked up, and back to sleep mode, GPS will shut off and GSM will works in low consumption mode. SMS, call will can wake up the tracker Sleep by shock sensor mode: After did this setting, if no shock for 5 minutes, the tracker will work under "sleep by shock" mode, GPS will shut off, GSM will works in low consumption. Vibration, SMS, call will can wake up the tracker History Route Playback: You can track the history route of the device up to 6 months via both the web platform and APP Alarm: There is anti-removal induction sensor on the back of device. If this covered induction sensor is not covered again.it will send "Loosing alarms!" to admin number and SOS number by SMS Specifications: Size: 112mm x 78mm x 28mm (4.4"*3.1**0.9") Weight: 300g Network: GPS Sensitivity: -159dBm GPS accuracy: 5m Wall charger: 110 -220V input, 5V-1A output Battery: Chargeable & changeable 3.7V 7800mAh Li-ion battery Stand by: 120 days Cold status: 45s Time To First FixWarm status: 35s Hot status: 1s Storage Temp.: -40℃ to +85℃ Operation Temp.: -20℃ to +55℃ Humidity: 5% - 95% non-condensing 4G Band: Band (4GC): 4G LTE-FDD: B1/B3/B5/B8 4G LTE-TDD: B34/B38/B39/40/B41 GSM:900/1800MHz Band (4GSA): 4G LTE-FDD: B1/B2/B3/B4/B5/B7/B8/B28 B66 GSM 850/900/1800/1900MHz