It Is Built-In 16 Gb Memory Of The Spy Hidden Cameras, Can Be Used For Digital Audio Video Filming ,The Product Is Simple To Operate: There Is A Good Hidden; It Can Also Get Satisfactory Results Even Though Under Interior Low Light; Better Sound Recording . Can Also Be Use Directly As U Disk. Home, Business, Education, Security, Media, Justice, Tourism, Health Care, Life In Areas Such As The Practical Tools Necessary. It Is Very Convenient.