Instruction manuals for all GoPro Hero models can be downloaded from the support section of the official GoPro website. Third-party websites, such as manualslib.com, also have sections dedicated to GoPro product manuals. Retail GoPro products also normally come boxed with hard copy instruction manuals.
When downloading the manual from the GoPro website, it is necessary to select your camera model. You can find your model by checking the casing and original packaging or by following instructions on the GoPro website support section.
The original GoPro Hero was released in April 2005. As of 2015, most owners have a device from the newer GoPro HD Hero line. The top model in this series, the Hero4 Black Edition, can record 4K video at 30 frames per second.