The F4 Slim is the compact and lightweight taximeter from Digitax, designed to meet the evolving needs of modern taxi operations.
It combines advanced technology, elegant design, and full connectivity in a slim and practical form factor.
Featuring a high-quality 4:3 LCD display (480×272), the F4 Slim guarantees clear and precise visibility under any lighting conditions.
Connectivity is built in — with GPS, 4G LTE or 5G Cat-M modem, and Bluetooth 4.x, providing fast, secure, and reliable communication with external devices.
Equipped with 7 intuitive buttons, 3 RS232 serial ports, 4 digital I/Os, and 5 power outputs, the F4 Slim enables customized and advanced control of all operations.
It supports up to 63 smart, OTA-updatable tariffs and includes the Digitax SDK for seamless software development and integration.
MID, OIML R21, and E-Mark certified, the F4 Slim ensures full compliance with international regulations.
Compatible with external printers, it’s the ideal solution for fleets seeking a modern, reliable, and fully connected taximeter in a smaller, smarter design.
- LCD display
- Compact and Lightweight
- Built-in GPS
- BT 4.x Built-in
- Built-in 4G LTE or CATM 5G modem
- 7 Buttons
- European MID, OIML R21 and E-Mark certification
- Compatible with External Printer
- 3 RS232 Serial Ports
- 4 Digital I/O Inputs/Outputs
- 5 Power Outputs
- 63 Smart and Independent Tariffs
- Digitax SDK for Development
- Updates via Digitax OTA
- Compatible with Digitax Device Tracking System
Download Technical Data Sheet
F4 SLIM - AVAILABLE CONFIGURATIONS
Advanced Taximeter
The F4 Slim is a technologically advanced taximeter developed to meet the new demands of the modern taxi market.
It combines innovation, reliability, and smart design, delivering efficient and intuitive operation for both drivers and passengers.
Compact yet powerful, the F4 Slim includes all the features of a full-size taximeter in a lighter and space-saving format.
For fleets requiring enhanced connectivity and built-in printing, the F4 Plus version is also available.
Built-in Bluetooth module
The F4 Slim can be equipped with a Bluetooth 4.x module, enabling fast and secure communication with external devices.
This connectivity allows seamless pairing with POS terminals for electronic payments and other supported accessories, improving flexibility and workflow efficiency.
Through the Digitax SDK, developers can integrate the F4 Slim with third-party systems, creating custom solutions and extending the device’s capabilities for professional taxi operations.
Built-in GPS module
The F4 Slim integrates an optional GPS module that provides continuous and precise vehicle geolocation.
This ensures accurate tracking, optimized routes, and enhanced fleet visibility.
Main functions:
Real-time fleet monitoring with accurate vehicle positioning
Geofencing for defining service zones and receiving exit alerts
Trip history and analytics for improved operational insight
Integration with the Digitax Device Track platform for full fleet supervision
With its integrated GPS, the F4 Slim helps operators maintain total control and efficiency across their fleet, ensuring reliability and safety on every route.
Built-in 4G LTE or 5G Cat-M module
To support modern taxi operations and real-time data exchange, the F4 Slim can integrate a 4G LTE or 5G Cat-M modem.
This connectivity ensures reliable communication with dispatch centers and secure data transmission for every trip.
Available options:
4G LTE Modem — for fast, stable broadband connectivity
5G Cat-M Modem — ideal for IoT applications with extended coverage and optimized power efficiency
Both versions enable real-time reporting, data synchronization, and OTA updates, ensuring a constantly connected and future-ready device.
LCD screen
The F4 Slim features a 4:3 high-contrast LCD display (480×272) that guarantees clear and accurate visibility in all lighting conditions.
Its integrated brightness sensor automatically adjusts the display level for optimal readability — day or night.
Key advantages:
Clear and customizable on-screen information
Automatic brightness adjustment for ambient light
Easy integration with Digitax Mobile Data Terminals for advanced fleet control
The display’s clarity and reliability make the F4 Slim a user-friendly solution for professional drivers, ensuring consistent performance and visibility at all times.
Compatible with External Printer
The F4 Slim can be paired with an external printer to manage trip receipts, daily reports, and fare summaries.
This expands its functionality and makes it suitable for a wide range of professional applications.
Full compatibility:
Works natively with Digitax TRE and Digitax QUATTRO printers
Supports automatic data transmission for real-time reporting
Designed for easy integration with fleet management systems
This flexibility allows taxi operators to combine on-board precision with seamless documentation, ensuring efficiency, compliance, and a fully connected workflow.
European MID, OIML and E-Mark certificates
The F4 Slim complies with the highest international certification standards for accuracy, reliability, and automotive safety.
Certified for:
-European MID Directive — ensures full compliance with measurement and fiscal standards for taxi operations
-OIML R21 — guarantees precision and consistency in fare calculation and data recording
-E-Mark Certification — validates use in vehicles, meeting all safety and electromagnetic compatibility requirements
These certifications confirm the F4 Slim as a trusted and compliant solution for professional taxi operators and fleet integrators across Europe.
Lightweight and Compact
Key specifications:
-Width: 11.6 cm
-Height: 8.5 cm
-Depth: 3.0 cm
-Weight: approx. 184 g
Main advantages:
-Compact structure for space-constrained installations
-Lightweight body ensuring easy handling and quick setup
-Robust construction designed for durability in daily taxi operations
– Flexible mounting options for seamless dashboard integration
TECHNICAL SPECIFICATIONS
Dimensions | Width: 11.6 cm Height: 8.5 cm Depth: 7 cm |
Weight | Gr. 370 ca. |
Display | Full Color Graphic LCD display Viewing area 4.3” diagonal WQVGA 480x272 Resolution Color TFT LED Display with 256,000 Colors Display clearly day and night viewable |
Power Supply | Operating Range 8 - 16 V |
Operating Temperature | From -20° to +80° C |
Humidity | 95% |
Mechanical Strenght | 3g |
Backlight Buttons | 7 retro illuminated user buttons |
Totalizator Mode | Trip by Trip Details 45 + 45 Statistic Memory 12 x 45 Monthly Statistic Statistic for each Driver |
Tariff Structure | 63 smart and fully independent tariffs, with 27.000 programmable parameters: Night tariffs Holidays tariffs Auto fare Tariffs Auto-distance tariffs Fix rate tariffs Regular tariffs distance or time Tariff Double tariffs distance and time Smart combined tariffs structures |
Tarfiff Management | Distance automatic switching Time automatic Switching Date automatic Switching Fare amount automatic Switching Remote command switching Fix agree rate Geo-fencing GPS automatic zone-cross switching |
Tariff Program Change | Manual by Key By External Command / Application By Programmer By Memory Key |
Peripheral Connections | Printer Magnetic Card Reader Passanger Sensor Mobile Data Terminal Cellular Phone by BLE Connection |
Communications Protocols | Comtax2 Protocol Other can be implemented or request |
Operative Firmware | Upgradable Firmware on Flash |
Transducer | Mechanical Hall Effect or Internal Adapter for Electronic Speedometer Up to 100.000 l/km |
Power Outputs | 1 Roof Light 25 Watts 4 Programmable Power Outputs 5 Watt |
Dimensions | Width: 11.6 cm Height: 8.5 cm Depth: 7 cm |
Weight | Gr. 370 ca. |
Display | Full Color Graphic LCD display Viewing area 4.3” diagonal WQVGA 480x272 Resolution Color TFT LED Display with 256,000 Colors Display clearly day and night viewable |
Power Supply | Operating Range 8 - 16 V |
Operating Temperature | From -20° to +80° C |
Humidity | 95% |
Mechanical Strenght | 3g |
Backlight Buttons | 7 retro illuminated user buttons |
Totalizator Mode | Trip by Trip Details 45 + 45 Statistic Memory 12 x 45 Monthly Statistic Statistic for each Driver |
Tariff Structure | 63 smart and fully independent tariffs, with 27.000 programmable parameters: Night tariffs Holidays tariffs Auto fare Tariffs Auto-distance tariffs Fix rate tariffs Regular tariffs distance or time Tariff Double tariffs distance and time Smart combined tariffs structures |
Tarfiff Management | Distance automatic switching Time automatic Switching Date automatic Switching Fare amount automatic Switching Remote command switching Fix agree rate Geo-fencing GPS automatic zone-cross switching |
Tariff Program Change | Manual by Key By External Command / Application By Programmer By Memory Key |
Peripheral Connections | Printer Magnetic Card Reader Passanger Sensor Mobile Data Terminal Cellular Phone by BLE Connection |
Communications Protocols | Comtax2 Protocol Other can be implemented or request |
Operative Firmware | Upgradable Firmware on Flash |
Transducer | Mechanical Hall Effect or Internal Adapter for Electronic Speedometer Up to 100.000 l/km |
Power Outputs | 1 Roof Light 25 Watts 4 Programmable Power Outputs 5 Watt |
FAQ
The F4 Slim is a compact, high-performance taximeter designed for modern taxi operations. It combines full tariff management, advanced connectivity, and lightweight construction for space-efficient installations.
Looking for a taximeter with integrated printer? Discover the F4 Plus Taximeter
It includes built-in GPS for vehicle tracking and Bluetooth 4.x for external pairing.
Optional modules support 4G LTE or 5G Cat-M connectivity, ensuring fast, reliable data communication and real-time updates
Yes. It is fully compatible with Digitax Printer TRE and Digitax Printer QUATTRO , as well as POS terminals for electronic payments.
Additional integrations are supported through RS232 serial ports and the Digitax SDK.
The device includes 3 RS232 serial ports, 4 digital I/O inputs/outputs, and 5 power outputs, enabling flexible integration with fleet systems and accessories.
The F4 Slim supports up to 63 smart, independent tariffs, which can be updated remotely via OTA (Over-The-Air) for quick, secure configuration.
Yes. The F4 Slim meets European MID, OIML R21, and E-Mark standards, ensuring precision, reliability, and full compliance with international taxi regulations.
The unit measures 11.6 × 8.5 × 3 cm and weighs approximately 184 g, making it ideal for dashboards where space and visibility are limited.
Absolutely. The F4 Slim connects seamlessly with the Digitax Device Tracking System and supports customization through the Digitax SDK for professional and scalable integrations.
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