If you want to stimulate two different areas at the same time or want to get hooked up with a partner the Duo Multi-Pack is the way to go. Combine anal and cock stim, anal and vaginal stim.... Alternatively you and your partner can wear one pad each on the buttock or inner thigh area and then have intercourse like you have never done before as the stimulation current flows between your two bodies! This pack is the most cost effective way to get started in powerful yet controllable dual channel stimulation. This pack retails for more than the EM80-E pack but you get an additional items and a saving compared to the items if bought separately!