Nasstoys Erection Assistant Hollow 6in Vibrating Strap On is fun for everyone! The hollow cavity allows for a penis user to insert themselves into the strap on to add girth or to help with ED but may be used by vulva owners as well as a traditional strap on. The comfortable, jock style harness accommodates most body types fitting up to a 60-inch waist. Press and hold the button located on the bottom right side of the testicles to power on. Then press again to cycle through the 7 vibrating functions. To charge, insert the pin charger into the charging port located on the left testicle. For the best experience, please pair with a water-based lubricant and clean before and after each use with toy cleaner. 7 Vibration function On, Off function button Phthalates free RoHS compliant Materials. PVC and Nylon Size Length 6 inch, Width 1.75 inches Rechargeable Charging Time 130 mins.