Doesn't work, defective unit, probably that's why it's so cheap. Press the record button and the red light will flash once then nothing, put the recording in a loop and you can't stop it. Insert a new SD card of the specified format. Nothing, it says it's formatted but I don't think it actually does anything, put a used card into hit format and it said it's formatted, put a used formatted card into my linux computer, and all the original data was still on it. So I formatted the card on my Linux