Please noted that: 1, The working temperature is -10℃-55℃.The battery is >-20℃. Please use the camera in a suitable temperature. HD Mini Super Small Portable Hidden Spy Camera-The Best Security Home Portable Camera. 2, This device requires a micro SD card (Sold Separately) to save video. 3, This camera only supports 2.4G WiFi, it can't support 5G WiFi. Most routers have both 2 frequencies... 2.4GHz (which is better for covering more distance) and 5.0GHz (which is typically better speed), you simply login to your 2.4GHz network to finish connecting. This JDM hidden camera is a world's smallest HD camera, It's a perfect camera and video recording forensic Tools for everyone. It can portable record what happens at every moment .Residential Surveillance Uses: (1) Monitor and secure interiors such as bedrooms, apartments, family rooms, nurseries, garages, guest houses, and more. (2) While away check in on pets, children and elderly persons. (3) Camera protects your home by deterring trespassers. Business Surveillance Uses: (1) Monitor and secure interiors such as offices, warehouses, showrooms, service desks, stockrooms, lobbies, and more. (2) Observe customers and employees in recorded or live video. (3) Deter criminal activities such as theft, loitering, and vandalism.