number automatically and 10 seconds help voice recording Network Support: The alarm panel built-in GSM Module, it support GSM SIM card, T-Mobile sim card can work with our system (This alarm do not including GSM sim card). When the sensor is triggered, the alarm panel will make an call or send alert message to the alert phone number you set before. The GSM (only) frequency is 850/900/1800/1900MHZ, which can be applied in all over the world; In GSM status, 6 groups calling alert phone number and 2 groups help SMS number you can set The alarm system can be used internationally, it can work under two conditions: No monthly fees and contracts with security companies. No network, standalone on-site alarming; Put-in a GSM SIM card (This alarm do not including GSM sim card) to call/send alert message, you can choose one of two ways or use all of them. The whole system complete with fully programmable main unit and wireless sensors. Before using, please kindly read user’s manual.