2019 latest Wi-Fi security camera by XMARTO. Multi-tasker: 1. This camera works alone without NVR 2. These cameras work in groups. In App you can group up to 16 cameras to form a quad-view, 8-view or even 16-view. 3. Note: these cameras DO NOT work with the NVRs. Main improvements: 1. 2-Way Audio - these outdoor cameras now have 2-way audio. 2. You can group up to 16 cameras and view them simultaneously. 3. With motion detection, you receive instant alerts on mobile when motion detected., Wi-Fi, 4*XmartO 1080P Bullet camera 4*12V 1A Power Supply 1*User Mannual, Easy to use