This Weighted Puppy Tail Plug Is A Great Way To Know When Your Pup Is Happy. The End Is Weighted, So With A Simple Shake, The Puppy Tail Will Sway With Excitement, Just Like The Wagging Of A Real Tail! When Your Puppy Deserves A Reward, Simply Use The Wireless Remote To Send A Wave Of Stimulating Vibration Deep Into Them. Cycle Through 5 Different Vibration Modes To Tantalize, Tease, And Teach Your Puppy To Come. The Plug Is Designed To Fit Comfortably Inside While Staying In Place, With A Bulbous End And A Contoured Base Designed To Keep The Tail Upright While It Is Inside.