Dahua Alarm Wireless Door Detector ARD323-W2 (868) Wireless door detector Signal strength detection Low battery alarm Temperature measurement Frequency hopping function and two-way communication technology ensure communication stability Cloud update and automatic recovery from update failure Port Indicator Light : 1 × green alarm indicator Button : 1 × power button Function Tamper Alarm : Yes Remote Upgrade: Cloud update Low Battery Alarm : Yes Test Mode : Yes Search : Signal strength detection Wireless Carrier Frequency : 868.0 MHz–868.6 MHz Communication Distance : Up to 1,200 m in an open space Communication Mechanism : Two-way Frequency Hopping : Yes Encryption Mode : AES128 General Power Supply : CR123A battery Power Consumption : Max. 125 mW Operating Temperature : –10 °C to +55 °C (indoor) Operating Humidity : 10%–90% (RH) Product Dimensions : 100.2mm × 20.8mm × 20.3mm (L × W × H) Packaging Dimensions : 135.0 mm × 98.5 mm × 27.8mm (L × W × H) Installation : Bracket mount Net Weight : 70 g Gross Weight : 115 g Certifications : CE Battery Life : 5 years Casing Material : PC + ABS Temperature Measuring Range : –15 °C to +65 °C (indoor) Measuring Precision : ± 1 °C  Resolution :1 °C Specification Sensor : Reed Switch Scenario : Non-metal doors Movement Distance : < 40 mm  Peripherals External Zone : 1-channel dry contact input