It is a SPY CAMERA IN HELMET (AS PER YOUR HEAD SIZE) in built with 16 GB micro SD card,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 used directly as U disk.Business, education, security, media, justice, tourism, health care, life in areas such as the practical tools necessary. It is very convenient.