Formerly know as the Hercules, the Hydro7 is designed for a user whose penis is 5-7"" (12.5-17.5cm) when erect. Designed for the first-time user it is the original worldwide patented Hydropump, and is used by thousands of men in over 120 countries. Designed to be used in the bath or shower as part of a daily routine (up to a maximum of 15 minutes in 24 hours, it utilizes the incredible power of water to safely increase the length and girth of the penis.