This electro-probe revs up to an impressive 12000 rpm in both vibration as well as electroshock mode and is super quiet at less than 50db. the remote control uses one single aaa (included) battery. made from super-smooth medical grade, phthalate-free silicone the total toy measures 29.5cm (11.6") in length and has an insertable length of 19.5cm (7.7"). the diameter varies from 5mm (0.2") to 7mm (0.28") always use with a generous helping of sterile water-based lubricant and insert slowly and incrementally for maximum pleasure.do not use e-stim with a heart defect or pacemaker without prior medical consultation. do not use e-stim during pregnancy. do not use e-stim in conjunction with flammable objects/liquids.e-stimulationusable with or without e-stimulationeasy to usevibrating