PT-51 is a powerful GSM/GPS safety phone designed mainly for seniors and lone workers. Its built-in GPS receiver has superior sensitivity and fasttime to first fix. Its quad band GPRS/GSM subsystem supports 850/ 900/ 1800/ 1900 MHz. System integration is straightforward as complete documentation is provided for the full featured @Track protocol. The Track protocol supports a wide variety of reports including emergency, geo-fence boundary crossings, low battery scheduled GPS position (with cell-ID reporting) and man down alert. The GT300 also supports inbound SMS display and a configurable 20 number address book.


  • Quad band GSM/GPRS 850/900/1800/1900 MHz
  • Internal u-blox chipset
  • Inbound SMS display and 20 number address book
  • Embedded full featured Track protocol
  • Indoor tracking and positioning through access point MAC address lookup services.
  • Low power consumption, long standby time with internal battery
  • Internal 3-axis accelerometer for power conservation and motion detection including man down alert
  • Internal GSM/GPS antennas
  • CE/FCC/PTCRB/GCF certified
  • Wifi for Indoor Positioning and Data Transmission
  • GPRS and GPS for Outdoor Positioning and Data Transmission
  • Instant Geo-fence Setting and Multiple Function Keys
  • Man Down Alarm


GSM Specification

Parameter Description
Frequency Quad band: 850/900/1800/1900 MHz
GPRS GPRS multi-slot class 12
GPRS mobile station class B
Max Out RF Power GSM850/GSM900: 33.0±2 dBm
DCS/PCS: 30.0±2 dBm
Dynamic Input
-15 ~ -108 dBm
Class Ⅱ RBER 2% (-107 dBm)
Stability Of
< 2.5 ppm
Max Frequency
± 0.1 ppm

GPS Specifications

Parameter Description
GPS Chipset u-blox All-In-One GPS receiver
Sensitivity Upto -160 dBm
Position Accuracy Autonomous: < 2.5m
SBAS: 2.0m
TTFF (Open Sky) Cold start: 30s average
Warm start: < 30s

General Characteristics

Parameter Description
Dimensions 94mm*48.5mm*18mm
Weight 90g
Battery Li- Polymer 850 mAh
Standby Time Without reporting: 190 hours
5 minutes reporting: 110 hours
10 minutes reporting: 125 hours
Charging Voltage 5V DC
Operating Temperature -20℃ ~ +55℃


Parameter Description
Mini USB Interface For external power and configuration
Power Button Power on or off device
SOS Button SOS/Emergency alarm
Volume Adjustable
Two side buttons to increase/decrease volume
Dial, Reject Button For dialing and rejecting incoming calls or menu selection
4 Preset Number
For quick dialing of preset numbers or menu selection