Published on: 2026.5.29
Author: Jlinkiot Team
The Real Problem: Blind Spots Cost You Money
Every logistics manager knows the feeling. You send a high-value shipment across the ocean or through a remote land corridor. Days pass. Then – silence. The container enters a dead zone with no cellular coverage. You have no idea if it's been tampered with, if the door has been opened, or even where it is.
By the time the signal returns, the damage may already be done. Cargo is stolen. Goods are spoiled. Or worse – you only discover a problem when the container arrives empty.
This is the reality of traditional GPS trackers. They rely entirely on 4G networks. When the network ends, your visibility ends.
The TL20 Solution: Zero Blind Spots. Zero Signal Gaps.
At Jlinkiot, we believe that asset tracking shouldn't have blind spots. That's why we developed the TL20 – a configurable hybrid e-lock that redefines global monitoring by seamlessly merging 4G, satellite, and long-range IoT technologies into one rugged, intelligent device.
Global Coverage: 4G + Iridium Satellite – Automatic, Seamless, Reliable
The TL20 is built for the harshest and most remote environments. It integrates an automatic switching mechanism between 4G and the Iridium satellite network.
What this means for you: When a shipping container travels from a coastal city (with strong 4G) into the middle of the ocean (with zero cellular signal), the TL20 detects the loss of 4G and instantly switches to satellite mode. No manual intervention. No data gap. No blackout period.
Whether your assets are crossing the equator, crossing a desert, or anchored at an offshore rig, the TL20 ensures continuous, real-time visibility.
Pain point solved: "My tracker stopped reporting in the middle of the ocean."
TL20 answer: Satellite takes over automatically. You never lose the signal.
Master Lock + Sub-Locks: One Container, Many Doors
Large supply chains often involve multi-door containers or trucks with multiple compartments. Traditional e-locks only secure one entry point, leaving other doors unmonitored.
The TL20 serves as the Master Lock, collecting data from TL13 Sub-Locks via LoRa communication (up to 5 km line-of-sight). This enables:
Multi-door monitoring – Know if any compartment has been opened
Cargo temperature & humidity tracking – Perfect for pharmaceuticals, fresh produce, or sensitive electronics
Extended interconnection – Add LoRa sensors for real-time alerts on door status, temperature changes, or vibration events
Pain point solved: "I have 4 doors on my container but only one lock. I don't know if side doors were opened."
TL20 answer: Sub-Locks report to the Master Lock. You see everything.
Power That Outlasts the Journey
Long-haul shipping can take weeks or months. Standard trackers die halfway through, leaving the rest of the journey unmonitored.
The TL20 packs a massive 20,000–25,000 mAh rechargeable battery, coupled with dual charging – DC power and solar charging (6V 1.8W monocrystalline panel). Even in low-light conditions, the solar panel trickle-charges the battery to extend operational life.
With intelligent sleep modes consuming as little as 1mA, this lock stays alive for months without maintenance.
Pain point solved: "My tracker battery died two weeks into a six-week voyage."
TL20 answer: 20,000+ mAh battery + solar charging + ultra-low sleep current = months of reliable operation.
Tamper Alerts: Know Immediately When Something Is Wrong
Cargo theft often begins with tampering – cutting a rope, forcing a lock, removing a device from its mounting.
The TL20 supports real-time alarms for:
Lock ON/OFF status
Rope cut detection
Tamper attempts
Device detachment
Vibration events
Low power conditions
Every alarm triggers an instant notification via 4G or satellite. You don't wait until arrival to discover a problem. You know the moment it happens.
Pain point solved: "Someone cut the lock and stole half my cargo, but I only found out at the destination."
TL20 answer: Instant tamper alerts. You respond in real time.
Key Features at a Glance
4G + Iridium Satellite – Automatic switching for global coverage
GPS (AT6558R chip, sensitivity down to -162dBm) – Accurate positioning anywhere
LoRa & Bluetooth – Local control and sub-lock integration
NFC/RFID (13.56MHz) – Card-based wake-up, sealing/unsealing
OLED display – Visual status of power, signal, lock condition
IP67 waterproof – Built for rain, dust, and harsh marine environments
Wide temperature range -30°C to +75°C (ultra-low battery option for -40°C)
Seven-color LED – At-a-glance status for GSM/GPS/Iridium/LoRa/power
Flexible for Your Use Case
Every asset is different. That's why the TL20 supports multiple unlocking methods: APP, Web, RFID card, SMS, Bluetooth, LoRa, and geofence rules. It also adapts to different sleep-mode strategies to balance responsiveness and battery life.
Whether you are:
Shipping high-value goods across oceans – Satellite backup ensures continuous tracking
Managing a fleet of refrigerated containers – LoRa temperature sensors keep you informed
Securing remote construction sites – Solar charging keeps the device alive
Monitoring rail cargo through tunnels and remote areas – 4G/satellite switching bridges the gaps
The TL20 can be tailored to your specific application.
The Bottom Line
The TL20 is not just a lock. It is a scalable, cost-efficient monitoring platform that delivers visibility where other devices go silent. It solves the real-world pains of long-haul logistics: dead zones, battery failure, tampering, and multi-door blind spots.
Ready to take control of your assets – even in the middle of nowhere?
