This camera is compatible with Micro SD cards up to 128GB. We recommend UHS Speed class 1, speed class 10 high-endurance cards from reputable brands to best support the constant video recording of the Maxcam. To remove the SD card, press firmly on the SD card to push it further into the slot. There will be a click and the SD card will pop out on release. Extract the card and replace as necessary by inserting a card into the slot and pressing until it locks in place. Please be sure to format the card in-camera before first use. 

Please note that our cameras use loop recording, where they overwrite older, unsaved files/video clips.  With that in mind, most users will not require an overly large card. We recommend a max of 128 GBs.