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Mandown alarm
Automatic alert is launched by vertical or horizontal device orientation, non-movement, impact and free fall.
![](/web/image/182456-ea644fde/Amber%20alert%20feature%20690x388.jpg)
Amber alert
Amber alert is a timer based alert for risky situations. The SOS cycle is automatically activated if device user has not reacted on a given time.
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Indoor location
TWIG devices equipped with SRD3 option can be located inside buildings by using cellular network or Wi-Fi, SRD or Bluetooth beacons.
![](/web/image/182465-656de6f0/SRD3%20Feature%20690x388.jpg)
SRD3 compatibility
SRD3 option expands device use cases with compatible short range devices, Wi-Fi base stations and Bluetooth Low Energy beacons.
![](/web/image/182469-3f6c8eca/WiFi%20feature%20690x388.png)
Wi-Fi communication
Wi-Fi network enables lone workers to alert help by calls and messages over Wi-Fi in areas where mobile network is not available or mobile network signal is poor.
4G and VoLTE
All TWIG lone worker alarms support 4G connection for SMS, data and VoLTE calls.
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![](/web/image/183660-c23790bd/Female%20operator%20in%20%20monitoring%20centre%20800x450.jpg)
Alarm monitoring
The alarm monitoring system is a solution to track and trace alarms triggered by the lone worker alarm device.
![](/web/image/182509-8b19a2a0/Attendance_Monitoring_feature%20690x388.jpg)