... \ Disarm the system by 5 ways: SMS, Main Host(Keypad), Wireless Keypad, Keychain Remotes, or even remotely by phones. (PSTN alarm ... fast “bi bi bi”)Support wireless “ding-dong” doorbell function (Optional)Support CID uploading to CMS(Center monitoring Station) , can user our GSM ... alarm, auto priority to occupy the telephone and monitoring function to hear what is happening.Built-in Li-Ion backup ...