【Support 256GB memory card】The hidden camera support 256GB micro SD card . The 256GB storage card can be stored for 45 hours of video files with no overwrite. Other cameras in the market can only support 32GB SD cards, and only 8 -hour video files can be stored ,and older videos will be overwrite..【Record while charging】 The hidden camera looks like a charger, and no one will notice that there is a HD lens in it. It will be start recording while charging. The mini camera is very small size, and easy to carry.Very hidden and smart ..【No Wifi No App】The spy camera need't wifi, needn't App. It is very suitable for the environment without network. When the spy cam is plugged into the outlet, it will record the videos automatically . All the videos will be saved on the SD card..【Motion Detection】The spy camera hidden camera built-in motion sensor system . When motion is detected, the camera will start recording automatically. The motion detection system will not waste time on a useless video.Note:The range of sensing distance within 3 meters is relatively sensitive..【Loop Recording】The nanny cam will keep record and overwrites the oldest files when the card is full.It's saved a lot of space for storage card, and it can also cover those useless videos.