1080P 8CH Wireless NVR (1TB HD Pre-installed) with 15.6"LCD Monitor, 4 units of 2.0 Megapixel Waterproof Outdoor Cameras with Audio Recording & PIR Sensor All in One system with 15.6" Full HD IPS monitor means that you don't have to buy an extra monitor for connection, so convenient. * Audio & Video record at the same time and Build-in PIR Sensor: An integrated microphone let you hear and record the sound around the camera, built-in PIR sensor will eliminate the number of false alarms you received by up to 90%, detects movement from animals, people, and vehicles. Pre-Alarm record mode without any missing event and save over 90% HDD storage if use PIR model record.