Description This item is a dog training whistle. It will provide convenience during dog silent training, recall. You can adjust the frequency of the whistle. Lightweight, portable, easy to carry and use for your convenience dog training. Features - Color: Silver - Material:Stainless steel - Size: 5.40X1.00X1.00cm/2.12X0.39X0.39in(not included chain) - Safe and convenientto use, not easy to break or deform, reusable and can be applied for longtime. - Come with chain for hands free. Lightweight for portable carrying.Release ultrasonic sound for dog fast training. - Attracting the attention of dogs without damaging their hearing and without any health problems. - Creative design whistle sound is a good tool to establish communication and training with love pet. - The professional whistle makes it easier to train pets, which can give you a great usage experience. Packing list1 x Whistle