... remotes(supports up to 4 remotes or wireless keypads per zone)supports 8 more wired zones ... by 5 ways :SMS,main host(keypad),wireless keypad,keychain remotes,or even remotely by phones ... opened,it will sound fast “bibibi”) 14.support wireless “ding-dong”doorbell function (optional) 15.support ... ~5 pc. …Wireless Siren ~1 pc. …Smoke detector ~1 pc. …Power Adaptor ~1 pc. Wireless Security GSM Alarm System ...