Name: GT21N Advanced OEM GPS Tracker 4G | Trusted Factory
Brand: GreatWill

Advanced GPS Tracker GT21N | GreatWill

Great Will GT21N is a simple, miniature 4G vehicle-mounted positioning terminal that supports a wide voltage input range of 9 to 90V and can be widely used for monitoring the location of vehicles such as cars, trucks, motorcycles,and electric vehicles. It has a built-in 25*25mm large-size satellite antenna, which provides excellent satellite search capabilities, strong signal reception, and accurate positioning. It supports TTL serial port communication and can communicate with various types of peripherals.

9-90V DC

Bluetooth Communication (optional) & TTL serial port (optional)

Driving behavior analysis

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Driving Behavior Monitoring, Wide-Voltage Tracking — GT21N

GT21N is a 4G LTE Cat-1 vehicle positioning terminal with GPS + BeiDou tracking, historical routes, driving-behavior analysis and multiple alarms. DC 9–90V input supports broad vehicle compatibility, while optional Bluetooth and TTL interfaces extend integration options.

Driving Behavior Analysis

GT21N monitors rapid acceleration, harsh deceleration and overspeed events to help fleet operators review driving behavior, improve safety management and support driver training.

Automatic Arming / Disarming

ACC status can be used to distinguish parked and running states. Compatible alarm workflows can automatically arm after ignition-off and resume normal tracking after ignition-on.

Optional Bluetooth / TTL Serial Port

Optional Bluetooth supports short-range configuration and compatible sensor integration, while the TTL serial interface provides an additional path for project-specific device communication.

9–90V Wide Voltage Range

A wide DC 9–90V input range supports deployment across many passenger, commercial and specialty vehicle electrical systems.

Technical Specifications

Specification	GT21N
Dimensions	74mm × 30mm × 13mm
Weight	30g
Working Voltage	DC 9V–90V
Working Temperature	-20°C to +70°C (-4°F to 158°F)
Backup Battery	55mAh / 3.7V Industrial Li-Poly
Network	4G LTE Cat-1
LTE Bands	FDD B1/B3/B5/B8; TDD B34/B38/B39/B40/B41
Positioning	GPS + BDS
Location Accuracy	<10 Meters (Open Sky)
Tracking Sensitivity	-165dBm
Communication Module	AirM2M Air780E
Standby Current	≤5mA

Main Features

Real-Time Tracking

Geo-Fence

ACC Detection

Blind-Spot Storage

DC 9–90V

GT21N Applicable Scenarios

Vehicle Anti-Theft Management

Logistics & Transportation

Car Rental

Global Multi-Version GT21N for Easy Deployment

GreatWill supplies GT21N vehicle trackers for insurance telematics, fleet operations, rental and distribution projects, with OEM/ODM customization available for regional and integration requirements.

After-sales technical support and product testing are available.
Configurations can be adjusted for local networks, vehicles and project requirements.
Warranty coverage can be up to 3 years depending on the project and commercial agreement.

Sample delivery is typically about 3–5 days.
Large-volume orders generally require more than 7 days depending on quantity and customization.
Devices, platform software and SIM/IoT-card configurations are inspected before shipment.
Multiple shipping methods are supported.

Driving-behavior monitoring covers rapid acceleration, harsh deceleration and overspeed events for safer fleet operations.
GPS + BeiDou tracking works with vibration, displacement, overspeed and low-battery alarms for vehicle security.
DC 9–90V input supports a broad range of vehicle electrical systems.
Optional Bluetooth and TTL interfaces provide additional configuration and integration flexibility.