SRT306i personal alarm front view
  • Developed in Sweden
  • Speaker and microphone
  • Vibration and motion detection
  • Quadband GSM/GPRS
  • 99 channel GNSS receiver
  • Supports GeoFencing
  • Intelligent power saving mode
  • Low battery alarm
  • Status LEDs
  • USB charging
  • Water and dust proof (IP54)
  • Small and handy size: 90x46x21,5 mm
  • Weight: 98g

Basic functionality

The basic functionality of the SRT306i is based on its predecessor SRT306, including GSM/GPRS communication and GNSS positioning.

Indoor positioning

SRT306i supports indoor positioning based on communication with RF tags (SRT334i/SRT334i2). An area with no GNSS coverage can be equipped with RF tags and each tag is programmed with specific position data. When SRT306i enters an area covered by a specific tag it receives the preprogrammed information. The range of the radio signal from each RF tag can be adjusted to achieve the desired coverage.

SRT306i has the ability to assess the optimal positioning method in any given situation. When available it will use GNSS but when devoid of such possibility it will instead attempt using RF positioning. If any available RF tags are found, the SRT306i will switch off GNSS positioning. The same will work in reverse, so the SRT306i will enable GNSS when losing RF connectivity and shut RF positioning off as soon as a GNSS position is received. This mode of operation maximizes battery lifetime.

Further configuration of positioning methods is also possible. For example, you can have the SRT306i use RF positioning during office hours. Or set it to switch to RF positioning upon arriving at a certain geographical location. Provided the SRT306i is outside and receives a GNSS position it can decide when it enters the designated area and can then switch to RF positioning.

Alarm relaying through RF routers

In certain areas not only GNSS coverage is lacking but also GSM. Such areas can be equipped with combined RF tag-routers (SRT334i2). In case of an alarm the SRT306i uses the closest SRT334i2 to obtain a position and then transfers the alarm message through a chain of SRT334i2’s to a relay station with GSM coverage, where the message can be forwarded to a GSM network. A message delivery confirmation is then relayed back to the SRT306i that originally generated the alarm.