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 tesitcles 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 testcile. For the best experience, please pair with a water-based lubricant and clean before and after each use with toy cleaner.7 Vibration functionOn/Off function buttonPhthalates freeRoHS compliantMaterials: PVC and NylonSize: Length - 6, Width - 1.75RechargeableCharging Time: 130 mins.