Here is a great beginner insert that can be used with or without an electrical connection. Consisting of 11 - 6mm (1/4") oblong beads that have a maximum diameter of 6mm.  It also has a 10mm round head on the top to use as a depth stopper.  Moving this six inch long insert up and down inside a well lubricated urethral canal creates amazing erotic sensations. 

By using an alligator clip wire, we recommend the Large size clip, you can bring this medical grade stainless steel insert to life, for yet another twist of eye-rolling experience.