Dahua ARA24-W2(868) Key Technical Specifications Wireless Protocol: Operates on the 868 MHz band using two-way communication technology with frequency hopping to ensure stable, interference-free transmission. Security: Features AES-128 encryption, which provides a high level of protection against unauthorized signal interception or cloning. Control Functions: Equipped with 4 buttons: Home, Away, Disarm, and a dedicated SOS emergency button. Transmission Range: Up to 900m in an open space. Battery: Powered by a CR2032 battery with an estimated life of up to 3 years under normal usage conditions. Status Indicator: Includes a two-color LED (green for normal, red for abnormal) to provide immediate visual confirmation of actions. Certification: Meets Security Grade 2 standards, making it suitable for professional residential and commercial installations. Durability: Compact and lightweight design (20g) made from PC+ABS materials, suitable for indoor environments within an operating temperature range of –10 °C to +55 °C.