Feature: 1. 2.4‑inch TFT full‑color LCD screen display, touch keyboard operation, simple operation, wireless transmission, easy installation, support doorbell function, Ding Dong, Ding Dong (default ringtone). 2. Support WIFI/GSM (2G), uninterrupted network, provide long‑term protection, safer and more assured. 3. One‑key SOS alarm function, you can secretly call the alarm in emergency situations (the default alarm sound can be set). 4. Support remote WIFI network APP alarm push, telephone, SMS, and other multi‑channel alarm methods and management. 5. Support 5 groups of preset alarm telephone and SMS numbers, each group to close/open management, one‑key operation to add wireless accessories, no need to divide defense zones, attributes, names, etc. 6. Support the main door, hall, distress, bedroom, window, balcony, perimeter, smoke, gas, carbon monoxide, water leakage, doorbell, PIR detector, door sensor detector, and other defense area names and numbers can be set arbitrarily. 7. Support the setting of defense areatypes such as outgoing zone, stay‑behind defense, doorbell, silent defense, 24‑hour defense area, etc. 8. Support multiple extended alarm displays and alarms such as main power failure, backup battery shortcomings, tamper‑proof alarm, etc. 9. Support free arm and disarm function, support arbitrary input of zone number, support for IOS system (within 12.3.1 version), for Android system. 10. Support 9 languages, Chinese, English, German, Korean, Spanish, Portuguese, French, Italian, Russian (default English). Specification: Item Type: Door Window Sensor Alarm Material: ABSAlarm Host Input Voltage: DC5V (Micro USB Standard Interface Power Supply) Working Current: <120mA Standby Current: <10uA Siren Output: <500mA Wireless Frequency: 433MHz Wireless Code: Ev1527 GSM Standard: 850/900/1800/1900MHz WIFI Standard: IEEEE802.11b/g/n Wireless Standard Alarm Host Battery: 3.7V/500mAh Lithium Battery (Included) Working Temperature: 0-55℃Solar Infrared Alarm Battery: 600mAh Polymer Battery (Included) Door Sensor Alarm Power Supply: 2 x AAA Batteries (Delivered Without Batteries) Infrared Alarm Power Supply: 2 x AAA Batteries (Delivered Without Batteries) Remote Control Battery: CR2025 80mAh (Included). Package List: 1 x Alarm Host4 x Remote Control6 x Door Magnetic Set2 x Installation Base 4 x Screw Pack1 x Data Line1 x Solar Infrared Alarm2 x Infrared Alarm 1 x Manual