Click hereSONOFF RF Bridge R2 433MHz RF to WiFi Wireless Gateway Smart Home HubSpecifications Brand SONOFFModel DW2 RFRF Frequency 433MHzWorking Voltage DC 12V Model 27A 12V Emission Current ≤20mAQuiescent Current ≤1 5uAWireless Transmission Distance Max 50mInstallation Gap 5mmWorking Temperature 10°C 40°CMaterial PC V0Features 1 Alert Notification Receive push notifications immediately when a door or window is opened or closed 2 IFTTT Function Compatible with IFTTT for enhanced automation and functionality 3 History Records Check Save and check history records of sensor activities over the last 3 months 4 Low Power Consumption Designed with low energy consumption technology ensuring up to 2 years of battery life 5 Smart Scene Integrate with other SONOFF smart home products to create automated scenarios and actions Package Include 1 x SONOFF DW2 RF Door Window Sensor