GSM STATION MONITOR,GSM STATION ALARM,GSM STATION SAFE DEVICE,GSM SECURITY AND PROTECTION,STATION SECURITY,SAFE EQUIPMENT,GPS FeaturesFor ... × 130mm (width) × 32mm (thickness)System componentsInstallation and use of this device, please prepare the following items:1, GSM Mobile phone: (phone ... . Alarm can be used for one cell phone operation)2, effective SIM card: 1 (Open SMS, with caller ID, the ...