Nguyễn Đại Trí

Six ready-assembled kits built by Nguyen Dai Tri and the 4GSAFE team: four fire alarm transmission kits over 4G/WiFi and two burglar alarm kits using magnetic door sensors. Each kit lists exactly what is included and where it fits best.

4G fire alarm transmission kits – four configurations, basic to complete

Fire alarm · Kit 1

Kit 1 – Basic 4GSAFE fire alarm transmitter (4G/WiFi, voice call & SMS)

Kit 1 includes the DIN-rail 4GSAFE transmitter, 12V adapter, 4G antenna and terminal block. It wires straight into an existing fire alarm panel and automatically places calls, sends SMS and pushes alerts to the website/app when fire is detected.

Best for: Homes, shops and offices that already have a fire panel and only need phone alerts.

What's included

• 4GSAFE transmitter (DIN-rail plastic enclosure)
• Voice call alerts, SMS, website/app
• 4G / WiFi connectivity, relay output for electrical devices
• 12V power adapter + 4G antenna
• Terminal block + genuine warranty label

Fire alarm · Kit 2

Kit 2 – 4GSAFE fire alarm transmitter with Meanwell IP67 24V power supply

Kit 2 adds a Meanwell LPV-20-24 IP67 waterproof power supply and a DC-DC step-down module with LED display, delivering stable 24V power to the panel and peripherals in damp or outdoor environments.

Best for: Outdoor cabinets, factories and humid areas that need durable 24V power.

What's included

• Everything in Kit 1
• Meanwell LPV-20-24 power supply (24V, IP67 waterproof)
• DC-DC step-down module with 7-segment LED voltage display

Fire alarm · Kit 3

Kit 3 – 4GSAFE fire alarm transmitter with emergency button and 24VDC relay

Kit 3 adds a twist-to-release emergency call point and a 24VDC two-contact interposing relay, allowing manual alarm activation on site and switching of high-power equipment such as smoke extraction fans, pumps or roller shutters.

Best for: Factories and warehouses that need manual alarms and equipment switching on fire.

What's included

• Everything in Kit 2
• Twist-to-release emergency button box (Kon Yong)
• 24VDC two-contact interposing relay with socket base

Fire alarm · Kit 4

Kit 4 – Complete 4GSAFE fire alarm set: 4G transmitter with 24V siren

Kit 4 is the complete 4GSAFE fire alarm set: 4G transmitter, waterproof 24V supply, emergency button, interposing relay and a loud 24V fire siren – sounding the alarm on site while calling the owner immediately.

Best for: Rental houses, shops and workshops installing a full fire alarm system from scratch.

What's included

• Everything in Kit 3
• Loud red 24V fire siren / bell
• Ready to install in workshops, shops and rental housing

4GSAFE burglar alarm kits – two configurations for homes and warehouses

Burglar alarm · Kit 5

Kit 5 – Basic 4GSAFE burglar alarm: door sensors, siren and 4G calling

Kit 5 includes the 4G transmitter, 24V siren, emergency button, DC-DC step-down module and two pairs of magnetic door sensors: any unauthorised door opening triggers the siren and rings the owner's phone instantly.

Best for: Homes, shops and kiosks protecting one or two entrance doors.

What's included

• 4GSAFE transmitter + power adapter
• Red 24V alarm siren
• Twist-to-release emergency button
• DC-DC step-down module with digital display
• Two pairs of magnetic door contacts

Burglar alarm · Kit 6

Kit 6 – Extended 4GSAFE burglar alarm for multiple doors, with Meanwell IP67

Kit 6 extends the burglar alarm with a waterproof Meanwell LPV-20-24 supply and additional magnetic door sensors, monitoring several entry points at once in multi-storey homes, warehouses and yards, with alerts by call, SMS and app.

Best for: Multi-door houses, warehouses and yards monitoring many entry points at once.

What's included

• Everything in Kit 5
• Meanwell LPV-20-24 supply (24V, IP67) for stable power
• Additional pairs of magnetic door sensors for more locations

Before building IoT devices for fire protection, Nguyen Dai Tri developed the ride-hailing app DNN – Đi Nhanh Nhất in Gia Lai, which was covered by the press. That product experience is the foundation of 4GSAFE today.

Today 4GSAFE is a personal brand that Nguyen Dai Tri researches, manufactures and sells himself – not a company. He personally handles everything from board design and kit assembly to warranty support.