Feature: This security alarm system consists of main panel/engine of alarm and various wireless-connected accessories/sensors. If someone enters the defense region illegally, the main engine/panel will activate the loud siren and call the number stored in the main panel notifying the intrusion of the specific zone, so the person can take an immediate action. The system provides an option to monitor the scene form your mobile only. Specifications: 1. GSM frequency: 900/1800 and PSTN Net 2. 9 defend zones:6 regular defend zones + 3 temporary defend zones 3. All Settings in English. 4. Alarm Siren volume control though System Panel. 5. Battery backup included in the Main Panel Package include: x 1 GSM&PSTN Alarm System x 1 Wireless PIR Motion Detector x 1 Wireless Magnetic Door Sensor x 2 Wireless Remote Controller x 1 High Power Siren (110dB) x 1 AC-DC Power Adapter (Choices of US, EU adapter) x 1 English User Manual x All Batteries & Fixtures Included SIM card is not provided. You should buy SIM from your local mobile operator. Verify your mobile operator supports GSM 900/1800 MHz frequencies. Extremely Powerful Siren! Wear ear protection on initial siren test/install.