[Wireless Communication]Utilizes ZigBee technology for reliable and efficient data transmission, solving signal interference and blockage issues. [Versatile Temperature Modes]Multiple adjustable temperature modes to suit various scenarios and environments. [Remote Monitoring]Wireless data signal transmission allows for convenient remote monitoring via smartphone. [Energy Efficient]Ultra-low power consumption design ensures long battery life for extended use. [Low Voltage Alert]Features a low voltage detection and notification function to prompt timely battery replacement. [Regular Reporting]Sends periodic online reports to the main control unit to ensure continuous monitoring. [Tamper-Resistant]Professional anti-tamper design for enhanced security in the field of protection systems. Specifications: Model: HS03 Communication Method: ZigBee Dimensions: 61.2 x 23mm Operating Temperature: -10-50anddeg C Power Supply: DC 3V (2 x AAA batteries, not included) Function: Detects human presence by sensing moving infrared radiation emitted by the human body within the protected area