Thank you for viewing. This is a clicker made by StarMark in the USA. I've disposed of the packaging, but it's unused. The size is approximately 6 x 4 cm and it's very light. A strap to prevent dropping can be attached. * Clicker training is a method of training dogs without scolding them. Training is done using the crisp "click" sound. The expressions of dogs reacting to the sound are also adorable. Thank you.