... 100pcs sensors Wireless gsm auto dial home security alarm system LS-GSM-100B Alarm Unit ... shall be sent automatically.14. Telephone function, allowing communication with any phone via the main unit ... for alarm place: help-seeking, fire, gas, door lock, living room, window, balcony or surrounding ... such as remote control, system arming/disarming, monitoring and intercom.20. Inquire event recording: the ...