Clicker 2 in 1: Click training uses a constant cue to mark desired behavior in real time, then motivates and rewards after that cue. Dogs know exactly which actions earn clicks and rewards, and they eagerly learn new behaviors. Easy Training: This is a good tool for you to teach the dog to obey and learn basic skills. This ultrasonic training tool can teach your dog unlimited commands, such as recall, sit, come, stop, stop and stop barking. PatientPlease note your dog needs to be trained multiple times to understand his commands. This item will not make your dog immediately obey your commands. Be patient. Do not push it. Size: about 7.5 x 3.5 x 2 cm The color red Quantity: 5 piece Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.