【Advanced Mesh WiFi System】--To ensure stronger WiFi signals, this system adopt the latest security grade WiFi chip. Cascade algorithm provides a longer range (up to 3000ft in open areas)wireless connection as well as improved penetration through walls and obstructions. 【Smart Light and Sound Alarm】-- This camera is alert and ready to react to any potential danger via smart light and sound alarm system - triggered by human motion events or controlled manually to keep troubles away. Built-in 2pcs brilliant white lights and high-pitched siren (up to 85dB) offering double insurance and let you stay protected even when you are asleep. And you won't miss any moment with remote and local playback. 【View from anywhere anytime】-- setup with free app and scan QR code to access real image on phone. Check in on your home or business wherever you have an internet connection. Free app for live view & Playback on smart devices with Wi-Fi or 2G/3G/4G anywhere anytime. 【Talk and listen just like never leave home】-- Built-in mic and speaker let you stay in touch with your household. Check in with the family or tell your dog to stop barking, or say hello through the ZOSI Smart App. 【Noted】--The cameras and the NVR require the power connection. They are not Battery Cameras.Wireless security cameras connect wirelessly to a NVR. They are designed for continuous recording, which requires them to be plugged in to a power source.