Real-Time 2-Way Audio & Audio RecordingWe 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 7/24 Record +Smart PlayBack Mode at Anytime1.Various Record Modes: Regular 7/24/365 Motion Detection. 2.Playback Modes: Sync Playback (4 cams at most) Motion Detection Playback Common Playback Intrusion/Crossing line Detection for Human/VehicleWe can customize the surveillance area or set a line for human/vehicle, and the alarm alerts will be triggered when detecting human/vehicle crossing the line or intruding the alarm area 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) Work with or without InternetFor local TV monitor surveillanc