FT4 Ex TETRA Handset

High performance and security in explosive environments

The FT4 Ex is a TETRA handset specifically designed for use in potentially hazardous surroundings, such as chemical factories or power plants. The device is intrinsically safe according to ATEX and IECEx standards and comes with a sturdy casing that is protected against dust and water jets (IP 65). The FT4 Ex is extremely robust and is suitable for use in areas such as Mining thanks to its enhanced impact resistance.

The high resolution 2.2'' TFT colour display guarantees best visibility even in difficult lighting conditions. The keys are illuminated and clearly demarcated, making the FT4 Ex easy to use even when wearing gloves.

The large red emergency button allows for quick reactions in case of an emergency. The individually assignable function keys can be configured to suit a wide variety of user needs and preferences.


  • Intrinsically safe according to highest ATEX & IECEx standards
  • Extremely robust with enhanced impact resistance according to mining standard
  • Wide range of audio accessories, even for hazardous areas
  • High resolution 2,2’’ TFT colour display
  • IP 65-class protection suitable for outdoor use (dust-tight and water jets protected)
  • Illuminated, clearly demarcated keys for easy use—even with gloves
  • Two microphones, one loudspeaker and earphone for loud and clear communication
  • Large red emergency button
  • Individually assignable function keys
  • Integrated GPS receiver
  • MicroSD card for storage of user-specific settings and parameters
  • SIM card for E2E encryption


  • Frequency range: 380-430 MHz or 410-470 MHz; others on request
  • Channel Spacing: 25 kHz
  • Duplex Spacing: 10 MHz (at 380-470 MHz)
  • RF Transmission Power: 1 W, performance class 4
  • Class of emission: 25K0 / W7D / W
  • Receiver class: A&B
  • Transmission power regulation: 3 steps of 5 dB
  • Sensitivity (stat. / dyn.): -116 dBm (min. -112) / -107 dBm (min. -103)
  • Dimensions: 145 x 60 x 36 mm / 141 x 46 x 31 mm (without antenna)
  • Mass: Approx. 384 g (incl. battery FT4 Ex 1700mAh)
  • Degree of Protection: IP 65 (water-jet and dust proof acc. IEC 60529)
  • Operation Temperature: -20... +55°C
  • Charging Temperature: 0... +40°C
  • Storage Temperature: -30... +75°C (without battery)
  • High resolution 2.2'' TFT colour display, 240 x 320 pixels, 262,000 colours, support for Chinese and Cyrillic character set
  • Explosion Protection ATEX (Mining / Gas / Dust):BVS 11 ATEX E 083 X: I M2 Ex ib I Mb / II 2G Ex ib IIC T4 Gb / II 2D Ex ib IIIC T125°C IP6x Db
  • Explosion Protection IECEx (Mining / Gas / Dust): IECEx BVS 11.0099X:  Ex ib I Mb / Ex ib IIC T4 Gb / Ex ib IIIC T125°C IP6x Db
  • Ex battery lithium ion, 3.7 V, 1700 mAh, incl. vibration
  • Operating time: up to 14 h (5/5/90, without GPS); up to 18 h standby
  • Fully integrated sGPS receiver sensitivity: 182 dBw (-152 dBm) / 185 dBw (-155 dBm) (Akquisition / Tracking)
  • Fully integrated sGPS receiver accuracy: 5 meter (50% probability), 10 meter (95% probability)
  • Fully integrated sGPS receiver protocol: ETSI Location Standard Reporting (LIP) 
  • Illuminated alphanumeric keypad
  • 3 freely assignable function keys at the side
  • Big and easily reachable emergency button
  • 3 navigation keys, 2 selection keys for easy menu navigation
  • Fast access to sub menues via navigation keys
  • Two-level rotary button for volume and group selection
  • Phonebook with up to 750 entries
  • User defined setting of audio parameter
  • User defined settings for behavior of FT4 in charger(Mute / Display / TETRA)
  • Micro-SD memory card
  • Voice Services TMO: Group calls (half-duplex), single call (half-/ full-duplex), telephone call (full-duplex), emergency call (TETRA and public networks i.e. 911); up to 1000 talk group entries; 16 scan lists with up to 16 groups per list; late Entry, Dynamic Group Number Assignment (DGNA)
  • Voice Services DMO: Group call, single call, emergency call to DMO group, support of DMO gateway and repeater mode; multiple DMO groups and channel
  • Status messages (up to 32)
  • Short Data Service - SDS (up to 16 SDS templates)
  • Packet Mode Data
  • Authentication
  • Air Interface Encryption Class 2 & 3
  • SIM card based End to End Encryption (E2EE)