Here is where you will find all the parts and pieces to get yourself started ( or add to ) your tens unit setup. Tens ( also called E-stim by some ) sends electrical pulses into your skin causing minor muscle contractions, tingling sensations, and usually a "Vibrating" feel. It is safe to use internally ( Anal or vaginal ) or externally with pads or other devices, however we highly suggest you only use this type of toy below your hips to be safe.