Ive used a lot of hidden cameras specially for people who need it to monitor what its happen at home or office basically, like for example if some information or objets were stolen in office ,what the cleaning people is doing in the office by night ,or controlling if the security guard is not sleeping ,or controlling if a baby is well taking …

https://www.amazon.com/WEMLB-Detection-Recording-Wireless-Surveillance/dp/B07L79XL33