... detector power lower will inform the users.9. Alarm report (for arm, disarm, power lower, power recovery) to be optional. ... real-time module18. 20 pieces alarm record,19. Backup battery for optional GSM module for optional part (850/900/1800/1900Mhz) 1. Support ... 8 telephone and message2. Support CONTACT ID3. 20 seconds for voice record4. Message content is including address, zone number, and ...