Wide Compatibility Compatible with NVR supporting Protocol On Vif, and also work with Hiseeu PoE NVR like YNVR-P-8 or Hiseeu PoE Camera System ASIN:B07HRKDD6B,B088YP8LPY, B09DV1CBXR,B0B4SCDZM7,B08XXGZVT2,B09DTZ559W, etc. Real Time 2-Way AudioWe can talk directly on phone app for asking courier to put package to a certain place you point, and hear sound from app or TV monitor connected to NVR Intruder Alarm lights and push alerts on Free APPWe could be alerted any time a person enter your property by receiving push notification from free phone APP, and the alarm light will be triggered to drive away the suspicious objects ( Note: APP has No Monthly Fees) HD 5MP & IP67 WaterproofHigh Resolution 2592 X 1944 pixel to provide your vivid and clear image no matter in day or night, and IP 67 Waterproof to withstand Changeable Weather like Snowy/Rainy Day Human/Vehicle DetectionWe can customize the surveillance area or set a line for human/vehicle, and the alarm ale