... time-setting, convenient for users and alarm center to control the system. 7. Can set 5 phone numbers, which used to receive ... , disarm or panic alarm, convenient and practical. 12. Can control the system by calling-in, such as arm, disarm, listening-in, output ... make sure the security of system. 14. Siren port for shift between silence and siren sound. 15. Optional built-in battery, AC and ...