Features:  - 850/900/1800/1900Mhz GSM Frequency for global use.  - The host supports setting 24 wireless alarm zones.  - Each zone has 5 defens e types to choose from: Normal / Stay / Smart /Emergency / Close Zone.  - Can store three groups of time arm and disarm function, each group can be customized by week, avoid manual frequent arm and disarm, to realize smart automatic control.  - Can set 4 groups of alarm phone numbers and 3 groups of SMS phone numbers.  - Voice prompt for all the operations.  - Low battery alert of the accessories.  - Build-in rechargeable battery.  - AC off SMS remind.  - Built-in sir en.  - Support wireless sir en (433Mhz frequency).  - Wireless learning code, fast and easy to add new accessories.  - Can revise zone name.  - Door Sensor two-way function.    Specifications:  Weight: 444g;  Dimension: 117*117*15mm;  Color: White;  Technology Parameters:  Siren: 85dB;  Input Voltage: DC 9V-12V;   Static Current: <25mA;  Alarm Current: <450mA;  Back-up battery: Lithium battery, DC7.2V;  WIFI: 2.4G, not support 5G WIFI;  GSM Frequency: Support GSM 850/900/1800/1900MHz;  Alarm Host RF receiving frequency: 433MHz (±75MHz), PT2262/1.5-4.7MΩ; EV1527/300K;  Alarm Host RF Transmitting frequency: 433MHz(±75MHz),PT2262/1.5-4.7MΩ; EV1527/300K;  Factory default password: 1234;  Working temperature: -10℃-5℃;  Work With: Amazon Alexa, Google Assistant, IFTTT;  APP Name: Smart Life;     Package Included:  1 x A1 Security Alarm System Host;  1 x PIR Sensor;  1 x Door Sensor;  2 x Remote Controller;  1 x Power Adapter;  1 x User Manual