IoT Products

The Zest4 Lone Worker is a device which is small enough to be carried on person without distracting or interfering with professional duties. Lone Worker transmits to the Zest4 servers in the same way as all other telematics offerings so we can actually place the whereabouts of each worker on the map alongside assets and vehicles.

Lone Worker goes one stage further and provides a line of communication with base should anyone working in isolation find themselves in trouble. Both SMS and Voice SOS calls to action can be made by the user to a pre-listed emergency contact number. In the event of a worker becoming incapacitated and unable to manually operate the device to initiate contact, an automated ‘man down’ alert will open up communication lines with base once a sudden change of orientation from upright to prone is detected.

Technical Specification

GSM / GPRS Features

  • Quad-band 900/1800 MHz; 850/1900 MHz
  • GPRS Multi-slot Class 12 (up to 240 kbps)
  • GPRS Mobile station Class B
  • SMS (Text/Data)


  • Bluetooth Specification V3.0
  • Bluetooth Transceiver compliant with Bluetooth Specification V3.0 for external peripherals:
    • Voice Calls Over Bluetooth
    • Configuration via Bluetooth- Bluetooth Sensors
  • Low Energy Bluetooth V4.0
  • Bluetooth transceiver compliant with Bluetooth specification V4.0 for external peripherals:
    • Beacons
    • Low power sensors


  • Tracking: 33/99 acquisition channels
    • 165 dBM sensitivity
  • Hot Start < 1s
  • Warm Start < 25s
  • Cold Start < 35s
  • NMEA 183 protocol
  • Accuracy < 3m


  • Magnetic USB Cable
  • 2 Configurable Buttons
  • Built-in Accelerometer / Gyroscope
  • Internal 800mAh Battery
  • Internal High Gain GNSS Antenna
  • Internal High Gain GSM Antenna


  • Alarm Button
  • Man-down Detection
  • Auto Geofencing
  • 50 Manual Geofencing
  • Over Speeding
  • GPS Sleep / Deep Sleep / Online Deep Sleep Modes
  • Action On Call Feature
  • Two-way Communication Over Bluetooth Headphones
  • Real Time Tracking
  • Sending Acquired Data via GPRS (TCP/IP and UDP/IP Protocols)
  • Smart Algorithm of GPRS Connections for GPRS Traffic Saving
  • Operating in Roaming Networks by preferred GSM providers list
  • Events from I/O Elements Detection and Sending via GPRS or SMS
  • Authorised Numbers
  • Time Synchronisation over NTP and NITZ
  • Offline Tracking Mode
  • SMS/GPRS Requests
  • Firmware and Configuration Update via Micro USB/FOTA
  • Configuration Through SMS
  • Smart Data Acquisition and Power Saving Modes
  • High Gain Internal GNSS and GSM Antennas
  • 1 RGB Status LED
  • Dimensions: 44 x 43 x 20mm




Environment » Temperature Range » Home and Office Use (-20°C / +55°C)
Mechanics » Vibration » Commerical
Mechanics » Vibration » Shock Resistant
Mechanics » Mounting » Other
Power Supply » Battery » Operation / Standby Time