GF21 GPS Tracker

GF21 GPS tracker is a small, and portable device. It is used to track the location of people or objects or vehicles. It uses GPS technology to determine the precise location of the device and shares the location via GPRS network to the user’s phone or web tracking software. The GF21 is designed to be discreet and easy to use, making it a popular choice for tracking vehicles, assets and kids.

gf21 gps tracker

How does GF21 Work?

GF21 GPS tracker works by using a combination of GPS (Global Positioning System) and cellular network technologies. The device has a built-in GPS module and antenna so it can receive coordinates from satellites. Once the device gets the coordinates, it sends them to a remote server by using the cellular GPRS network.

The server then processes these coordinates (geo-coding) and makes it available to access through a smartphone app or web tracking software. The user can view the location of the GF21 tracker in real-time and set up geofencing alerts to receive notifications when the tracker enters or exits a specified area.

GF21 GPS tracker also has a built-in rechargeable Li-ion battery. Depending on tracking interval or usage, it can last for several days. The device is charged by a USB cable when power is low. With the SOS button, the user can send out a help message and call by pressing the button. With a microphone, the caller can listen to the voice around GF21, as well user can control the device to record the audio around the device.

GF21 Features

1 Accurate Location tracking by GPS LBS and WIFI

2 Live Location tracking on APP and Web

3 History traces playback on APP and Web

4 Remote voice monitoring/ listening-in with high definition silicon microphone

5 Remote audio recording on APP

6 Unlimited audio recording times

7 Auto audio recording when shock detected

8 Auto audio recording when voice is detected above 60 db

9 Geo-fence alarm to give alert when GF21 moves out the preset area

10 Built-in 450mah rechargeable battery

11 Low battery alarm

12 SOS alarm

13 Auto callback when voice is detected above 60db

14 Auto callback when shock is detected

GF21 Tracker Specifications

Positioning accuracy 10 – 50 meters
Memory support Do not support. Have unlimited recording space on APP
Positioning accuracy GPS+WiFi+LBS+AGPS=10-50 meters
Recording range 80 square meters
Platform view SMS + APP + computer
Communication frequency 850 / 900 / 1800 / 1900MHz
Charging input 5V voltage
Working temperature -20 – 85 Degree
Network standard GSM / GPRS
Microphone Buit-in for voice monitoring and audio recording
SOS button Emergency alert
Backup battery 500mAh
Product size 26*13*43

GF21 GPS Tracker instructions manual

Per the below SMS commands, you can set up G21 tracking device

Locator SMS operation guide
Function SMS commands Replies Note
Binding a master control number 000#number#number#number# 000#1234477# Max can bind 3 numbers only or just one number
Message recording 111 Start recording 10 GF07 model with memory card shall operate.
Audio recording 222 Voice control recording 10 When environment voice is above 60db, device will start a loop recording 10 minutes. GF07 stores on memory card. GF21 GF09 GF22 records on APP at 1 minute per record.
Voice-activated callback 333 Voice-activated telephone alarm When environment voice is above 60db, device dials master number
Turn off all functions 555 Turn off all enabled functions Disable all functions manually on the device.
Vibration-activated SMS 666 Vibration sms alarm When the device detects vibration, it sends SMS to the master number.
Vibration-activated callback 777 Vibrating telephone alarm When the device detects vibration, it automatically dial the master number.
Recording for 10 seconds upload to app 789 Sending a recording 10 Device records 10 seconds and send to app
SMS positioning 999 Location Location of equipment by WIFI or AGPS or LBS
Modify GPRS interval #md#second MD#10# OK Can be set from 10 to 60 seconds
Modify GPRS interval Time#minute Time# Can be set to 1 or 3 or 10 minutes
Set heartbeat interval Heartbeat#time# Heartbeat#time# Can be st from 10 to 120 seconds
Enable track upload 123#1 OK/ON Device will send gps data to server so as to check history traces
Close track upload 123#0 OFF
Password restore Pwrst Restore the original password 123456
Restore device 1122 OK Device will be restored in 1 minute
Query IMEI Imei# IMEI+SN number If barcode is lost, use this to get device IMEI
Restart device SYSRST# Restart after 1 minute
Set device LED on/off LED#on




GF21 GPS Tracker Tracking APP

Search GF21 Tracking APP at Appstore or Google Play “zerogps” so as to download. It is free to download. All units bought from UniGuard enjoy life time free tracking service. No subscription charge.

gf21 gps tracker app

GF21 GPS Tracker Voice Recording Test

GF21 has voice recording feature. The recorded voice either stores locally in TF card or on phone appplication. User can send command from APP to start voice recording at interval of 30 secs or command device to automatically do voice recording as long as there is shock or louder voice.

gf21 gps tracker

GF21 Tracker Battery Life

GF21 tracker battery is 450mAh. It has several tracking modes. We can choose the right mode so as to increase battery life and reduce charging times.

gf gps tracker battery life

GF21 Review

Positive reviews: Good location accuracy, ease of use, and long battery life. It is very helpful in keeping track of their vehicles, pets, and children. Also, GF21 is small in size and discreet in design, making it easy to hide. What’s more, the real-time tracking feature is highly recommended by customers, as it is very useful in locating lost or stolen items. GF21 can do a clear voice monitoring nad vioce recording on APP.

Negative reviews: The device’s cellular coverage is small that it may not work in areas with weak or no network coverage. However, GF21 works excellently at place with good GSM coverage.

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