Convenient Voice Alarm Recording and Response Set All the functions including voice message recording and phone number registration are set by phone. Multiple Transmission and Centralised Control Up to 7 phone numbers(landline or cellular) can be registered(No.1~7) for voice alarm and it is suitable to notify a number of persons. For centralized control, a recorded message in No.1 is transmitted to a remote server. Various User Settings Registration of receivers, duration of monitoring channel changes, channel emergency, number of retransmission, repeat interval, and device ID can be configured. Device ID set is to identify the receivers and not to retransmit until a new alarm. Wide Range of Input Voltage The default range of imput voltage is AC or DC 10V~220V and it can be used for other ranges by replacing a sensing error. Auxiliary Battery Connection for Emergency A rechargeable battery(lead-acid battery: 1.2Ah) can be used as an auxiliary battery to monitor a blackout or operate in emergency. There is no need to connect an adapter when 12V is plugged into the terminal of rechargeable battery.