Main Features:<br />Key ring loop included<br />The ultrasonic. Human can not hear it↔? but dog can hear it<br />Some tips to use the dog whistle:<br />Use the dog whistle with varying sequences to train your dog<br />The behavior according to your instruction need to be trained for many times<br /><br />    Specifications<br />Specification<br />	 For: Dogs                                                  <br />                        Material: Metal                                                  <br />                        Season: All Seasons                                                  <br />                        Color: Silver                                                	<br />Dimension and Weight<br />	 Product weight   : 0.034 kg                                                  <br />                        Package weight   : 0.120 kg                                                  <br />                        Product size (L x W x H)   : 6 x 1 x 1 cm / 2.4 x 0.4 x 0.4 inches                                                  <br />                        Package size (L x W x H)  : 6.5 x 2.8 x 13.5 cm                                                	<br />Package Contents<br />	 Package Contents: 1 x Dog Whistle↔? 1 x Key Chain                                                	<br /><br /><br /><br />                                                <br />