【Name】: Ultrasonic dog whistle [Specifications]: 5.5 * 0.8 cm [Material]: Brass 【Weight】: 12g [Color]: silver [Applicable to]: Hunting dogs, work training companion dogs stay away from call [Method of use]: Loosen the sound wave adjustment screw, while blowing air through the air inlet, rotate the adjustment rod to adjust it to the appropriate syllable ;; Once the adjustment rod is screwed in, tighten the sound wave adjustment screw. This dog whistle is mainly designed for ultrasound, the brass whistle can emit high quality ultrasonic wave.Note: There will be a certain color difference in the lighting effect when shooting Pictures, please refer to the actual product! [Detailed Introduction]: The dog training flute can be adjusted to suit your pet’s dog voice as needed, so that the animal can understand the meaning of the owner according to the tone of the flute .It is easy to train your pet.