The Nasstoys Dynamo Vibrating Masturbator Cup accommodates all penis shapes and sizes with its sleek, discreet design. andnbsp;Open at both ends, the user may insert their penis using a water-based lubricant and stroke as they would naturally with their own hand. andnbsp;10 powerful vibrating functions and the textured tunnel deliver powerful sensations. This stroker can also be a fantastic oral sex aid to be used with a partner! andnbsp;Place over the penis of a partner using your favorite flavored water-based lubricant then stroke up and down while only placing as much or as little into one`s mouth as desired to create a deep-throat like sensation without the sore jaw! Please clean before and after each use with toy cleaner and allow to dry before replacing the caps onto each end. andnbsp;To power on, press and hold the power button until vibration begins then press again to begin cycling through the vibration patterns. andnbsp;Press and hold to power off. andnbsp;To charge, please align the magnetic connectors on the charger to the contact points on the stroker`s outer shell then connect the USB end into a power source. andnbsp;andnbsp; 10 Dynamic functionsRoHS compliantPhthalates freeWaterproofMaterials: TPE and ABSSize: Length - 4.5, Width - 3.5Rechargeable: Charging Time - 2 hours, Working Time - 1 hour, Voltage - 5V