M38 Voice-Enabled 4G 3G 2G GPS Tracker for Vehicle Asset Person Locating Tracking with SOS
1. Product Overview
The M38 GPS Tracker is an ultra-compact, high-performance tracking device designed for real-time positioning and monitoring. With triple-mode satellite support (GPS+Beidou+GLONASS) and 4G Cat1 connectivity, it ensures accurate and reliable tracking for vehicles, assets, or personal use. Its plug-and-play design, built-in backup battery, and magnetic charging make it easy to install and maintain.
Since it has voice functionality, this product is only sold in countries where it is legally permitted. It does not support unauthorized surveillance or recording, and all voice features are strictly designed for legitimate purposes such as emergency communications and authorized location tracking.
2. Key Features
Triple Positioning: GPS + Beidou + GLONASS for high accuracy.
Real-Time Tracking: Live location updates with trajectory playback.
Electronic Fence Alarm: Alerts when the device moves beyond a predefined area.
Easy Installation: No power button; auto-activates when powered.
Built-in Backup Battery: Ensures continuous operation during power interruptions.
4G Cat1 Module: Stable connectivity with low power consumption.
Remote OTA Upgrade: Firmware updates without physical access.
3. Product Parameters
| Parameter | Details |
| Main Chip | 4G Cat1 Module |
| Frequency Band | 2320-2370MHz / 2575-2635MHz |
| SIM Card | China Mobile 4G patch card |
| Positioning Accuracy | <5m |
| First Positioning Time | Avg. 32s (cold start) |
| Transmission Protocol | MQTT |
| Output Power | 28.0 ±2dBm (both frequency bands) |
| Receiver Sensitivity | -107dBm |
| Sensitivity | Cold Start -145dBm |
| Hot Start -156dBm | |
| Warm Start -145dBm | |
| Navigation -160dBm | |
| Tracking -162dBm | |
| Built-in Battery | 5000mAH (optional) |
| Operating Temperature | -20°C to +60°C |
4. Core Functions
| Function | Description |
| Scheduled Tracking | Reports latitude/longitude at set intervals. |
| Electronic Fence | Triggers alarms when the device exits a predefined area. |
| Historical Trajectory | Stores and replays 90 days of travel data (speed, direction, stops, etc.). |
| Pedometer Mode | Optional step-counting feature (on/off configurable). |
| Power Alarm | Sends alerts when main power is disconnected. |
| Data Reporting | Real-time GPS updates with customizable reporting (4x/day default). |
5. What is 4G Cat1?
4G Cat1 (short for 4G Category 1) is a classification standard for terminal devices in 4G LTE networks, designed as a low-power, low-cost, medium-to-low-speed communication solution for the Internet of Things (IoT). Below is a detailed breakdown:
(1). Basic Definition
4G Cat1 is one of the 4G LTE terminal categories defined by 3GPP (the international telecom standards body), optimized for IoT devices. It offers moderate upload/download speeds while meeting most IoT application requirements.
Key Features:
- Speed: Downlink 10Mbps / Uplink 5Mbps (theoretical).
- Power Efficiency: Lower consumption than traditional 4G Cat4, ideal for battery-powered devices (e.g., our GPS tracker).
- Cost: Modules are inexpensive with simple hardware design.
(2). Comparison with Other 4G Categories
| Category | Downlink Speed | Uplink Speed | Use Case |
| 4G Cat1 | 10Mbps | 5Mbps | IoT (GPS trackers, shared devices) |
| 4G Cat4 | 150Mbps | 50Mbps | Smartphones, HD video streaming |
| 4G CatM1 | 1Mbps | 1Mbps | Ultra-low-power IoT (e.g., smart meters) |
(3). Why Youwei GPS Tracker Uses 4G Cat1
- Battery Savings: Fits long-term standby tracking.
- Adequate Performance: GPS data requires minimal bandwidth (no need for high-speed video streaming).
- Wide Coverage: Compatible with existing 4G base stations, no extra infrastructure needed.
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