HydroVibe lets you add an extra dimension to your Bathmate routine through the use of two Bathmate VIBE Bullet vibrators. By adding vibration to the water-based power of your pump, you'll be able to significantly increase blood flow to the penis, quickly building up a harder erection for even better size gains (while also feeling great to use). Ride a wave of pleasure with this spa-inspired Vibe Chrome Vibrating Bullet that blends 2 natural therapies, soothing vibrations therapy with relaxing hydro therapy. Material: Silicone USB rechargeable, cable included Charging time - 2 hours