The Nexus iStim is a revolutionary stimulation system to excite your erogenous zones and increase sexual pleasure to electrifying heights! The iStim system uses a TENS machine (Transcutaneous Electrical Nerve Stimulator) to deliver small electrical pulses into the body via electrode pads placed onto the skin or via the use of various Nexus toys. The iStim is supplied with specially designed electrode pads but can be used with any of the extra exciting add-ons available.