The cameras and the NVR require the power connection. They are not Battery Cameras. WiFi security cameras mean the cameras connect wirelessly to a NVR. WiFi security cameras are designed for continuous recording, which requires them to be plugged in to a power source. 3MP Super HD Visual Quality. With 3MP high resolution, the wireless security camera system present you with clear and smooth videos in subtle details. Three Night Vision Modes. Black & White Mode by Default. Switch to Full Color Night Vision by human movement. Black & White Night Vision. Auto Pair, True Plug & Play, Remote Access in Minutes. Download Free ZOSI Smart App on Smartphone or AVSS on PC. Enjoy Live View from Smartphone, Tablet or PC. Advanced Mesh WiFi System. Up to 3000ft WiFi range in open areas. Boast cascading and anti-interference algorithm, it provides higher performance for long distance and reliable WiFi connection. High penetration through walls and other obstacles. Note: Only support 2.4 GHz WiFi. See, Hear and Talk over the Camera. Use two-way audio to respond to guests or warn off the unwanted from anywhere. Smart & Active Deterrence. The camera detects humans and activates spotlight and siren alerts to send strangers running. Advanced H265+ & AVBR Video Format. Save storage space with the latest H. Smart AI Human Detection. Upgraded human detection will trigger alerts (emails, App push notifications and buzzer) instantly when human is spotted in your motion zone to let you know someone is approaching your home, effectively avoiding “false positives” caused by pets, cars or leaves. A sliding cover design make it easy to slot the hard drive into your NVR. Note:This NVR comes with a 1TB or 2TB hard drive according to your choice. This security system supports all day and night recording of all cameras at the same time.