Features: High-Quality Material: The handheld ultrasonic bark stopper is made of high-quality material, which is wear-resistant and sturdy and not easy to break. Portable Design: The dogs repeller is compact and handheld, easy to carry and use immediately when walking, jogging or hiking to prevent dog attacks when out and about. Ultrasonic technology: emits high-frequency sound waves that are unpleasant to dogs (inaudible to human ears), preventings them from approaching or showing aggressive behavior. Lighting: Designed with luminous lights to improve visibility when walking at night or in low light conditions. EASY E: The handheld dog repeller is simple to operate and requires just a button to activate, making it suitable for all ages and experience levels. Description: Material: ABS Size: 13* 2.5*5cm Battery specifications: 9V battery Dog repelling is not effective in the following situations: 1. The dogs you keep because it knows that the owners will not hurt it; 2. Noisy environments, such as downtowns areas or roadsides; 3. Dogs that stay with their owners - dogs rely on human power; traineds large dogs - well-trained; 2. When the battery voltage is too low - the transmitting power is low. The above situation will not affect the effectiveness of this product, because dogs at home, dogs that often go shopping, dogs with their owners, and well-trained dogs will not bite people; Note: It is best not to deliberately tease the dogs with a dog repellent, because it will be no surprise if the dogs hears it too much. When the dogs repellent light is obviously dim, replace the battery in time. Package List: 1 x Handheld Glowing Ultrasonic Dog Repeller(With Battery) or 1 x Handheld Glowing Ultrasonic Dog Repeller(Without Battery)