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Hibernating Asset Tracking Device


The GL500 is a powerful GPS tracker designed for fixed asset tracking applications. It is powered by user replaceable CR123A lithium battery pack. Configuration allows it to wake up on a preset schedule to check if it needs to shift from dormant to active status and/or send update of its current location, and then return to a dormant state. Optimally configured, it will operate autonomously for 1800 days. Its built-in 3-axis accelerometer allows the GL500 to detect asset movement and transmit an alert message. The integrated @Track interface protocol allows the GL500 to communicate with a customer mobile phone or a backend server via GPRS/SMS and transfer reports like GPS position. System integrators can easily incorporate the GL500 into existing tracking systems based on this full featured protocol.



  • Low power consumption, long standby time for about 1800 days

  • Powered by three user replaceable lithium batteries (CR123A)

  • Internal u-blox chipset

  • Quad band GSM/GPRS 850/900/1800/1900 MHz

  • Embedded @Track protocol

  • Internal 3-axis accelerometer for motion detection

  • Internal GSM antenna

  • Internal GPS antenna

  • Internal microphone (optional)





GSM Specifications

Quad band : 850/900/1800/1900 MHz
Compliant to GSM phase 2/2+
-Class 5 (2W @ 850/900 MHz)
-Class 1 (1W @ 1800/1900 MHz)
GPRS multi-slot class 8
GPRS mobile station class B
RMS Phase Error 5 deg
Max Out RF Power GSM850/GSM900: 29.0±2 dBm

DCS/PCS: 30.0±2 dBm

Dynamic Input Range -15 ~ -108 dBm
Receiver Sensitivity Class ⅡRBER 2% (-107 dBm)
Stability Of Frequency < 2.5 ppm
Max Frequency Error ±0.1 ppm

GPS Specifications

GPS Chipset u-blox All-In-One GPS receiver

Autonomous: -147 dBm

Hot start: -156 dBm

Reacquisition: -160 dBm

Tracking: -162 dBm

Position Accuracy
Autonomous : < 2.5m 
SBAS : < 2.0m
TTFF (Open Sky)
Cold start : 27s average
Warm start : < 27s average
Hot start : 1s average


Audio Internal microphone
GSM  Antenna Internal only
GSM  Antenna Internal only
Internal Indicator LED GSM, GPS and battery status
Serial Port Internal 8 pin connector for upgrading or debugging

General Specifications

Dimensions 80mm * 58mm * 26.8mm
Weight 55g (without batteries)
Batteries Three CR123A Lithium-batteries 1500 mAh
Standby Time

Standby current: < 10 uA

SMS count: 1950 SMS

SMS reporting standby:

         One SMS report per day: 1950 days

TCP reporting standby:

         One report per day: 1800 days

         Four reports per day: 510 days

         Five minutes reporting: 11 days

Operating Temperature -20℃ ~ +60℃

Air Interface Protocol

Command Set @Track protocol command

Simple SMS command

Transmit Protocol TCP, UDP, SMS
Working Mode  Power save mode, for long standby time

Continuous Mode, for emergency tracking 

Scheduled Timing Report Report position and status according to preset time schedules
Geo-fence Supports up to 5 internal geo-fence regions
Low Power Alarm Alarm sent when internal battery power is low
Motion Detection  Motion alarm trigger and optional change of working mode
Wakeup Report  Report when the device wakes up 
Listening Mode Incoming/outgoing call with white list support 



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