This weighted puppy tail plug is a great way to know when your pup is happy. 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. 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. Measures 7.5 in. long, 3.5 in. insertable, 1.8 in. diameter, tail is 10 in. long. Requires one 23A-12V battery, included, and two AAA batteries, not included.