Features: * Bark Control & Dog Training - Our bark control device offers a safe and effective solution for dog training and bark control. Suitable for Dogs of All Sizes - The bark control emits a super audible frequency tone of 20-24KHZ, the tone does not affect humans but can attract the dog’s attention. Don’t worry about carrying it outside and hanging it on the tree. And the button on the surface of the product has a fluorescent effect, which is convenient to run even at night. Portable size and rechargeable - The device fits perfectly in your hand. With rechargeable lithium battery, 2 hours charging can be used for 15 days and standby for 60 days. If you have hearing problems, and we do not recommend using this product on dogs under 6 months and under 8 years old, as it may affect the dog’s hearing development. Training is required to achieve highly effective and long-lasting use. Specification: Item Name: Anti Bark Device Material: ABS Color: Gray Power: 3.7V 600mAh Lithium