Size: About 7.5x3.5x2cm/2.95"x1.38"x0.79". Pet dog training and combo in 8 colors to choose from. Can be used to train basic , small trick, and correct the bad behavior; Scientific methods of training your pet safely and easily.The with is very loud, you can use it outdoor. Stop barking and dog obdeience. Train your dog quickly just by simply pressing the and command. Well constructed and , will not rust. Big button for easy clicking and loud sound. Easy to use in any position.