Effective Barking Deterrent - This ultrasonic dog whistle serves as an anti-barking device, successfully controlling your pet's excessive barking behavior and creating a quieter environment . Unique Dual Head Design - Featuring a double head and double speaker for a coverage, this training device ensures effective training and improved behavior for your pet. Safe & Humane - Our ultrasonic dog barking deterrent is a non-invasive and humane way to train your dogs It doesn't cause any harm or discomfort to your pet, ensuring a healthy training . Easy to Use - Our device is designed for simplicity and convenience Versatile Training Device - Apart from barking control, this ultrasonic whistle can also aid in behavior training, helping you correct other unwanted habits of your and improve overall behavior. Color: black Material: plastic Package Contents: 1 x Dog repellent 1 x battery Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.