106-305S 4G Wireless Security System Monitoring & Two Way Voice Ness 106-305SOverview 106 305S 4G WIRELESS SECURITY SYSTEM NESS Guardpost is a fully self contained security system including an on board motion sensor, loud siren, and wireless receiver for remote sensors and Arm Disarm radio keys. Guardpost? s onboard GSM dialler gives it complete independence from landlines and allows reporting in Contact ID format back to base, audible voice reporting to any telephone, SMS reporting to mobile phones, SMS arming arming