We aren't physicists over here (shocking, we know), but we do know that the driving force, or 'thrust,' behind the Passion Pounder was/is your or your partner's extreme pleasure. Packing a ridiculous amount of power into a familiar, body-safe silicone shape, the Passion Pounder puts three thrusting modes AND ten modes of tip rotation in your hand.Speaking of hands, you can hold your Passion or play totally hands-free—just stick the sturdy suction base on a flat surface. However you play, simple (and separate) buttons on the balls or an included remote activate and cycle through your thrusting and vibrating options.The premium silicone Passion Pounder is easy to clean (use mild soap and water or your favorite toy care fluid/foam) and safe to use with any water-based lube you love. It's USB rechargeable, and the cord is included, and the remote takes 1 AAA battery (also included). The Passion Pounder isn't rated as waterproof, so please don't submerge it.