The SizeGenetics device is a fully registered medical type 1 device, that has the medical backing of several doctors who are experts in the field of sexual health and wellbeing. There are many extenders out there who have none of these, and are potentially dangerous to users who try them. https://www.pinterest.com/scotty81/sizegenetics-review/ https://visual.ly/community/infographic/business/sizegenetics-results