Feature: 1. USB Rechargeable: Ultrasonic dog barking deterrent has a built‑in 1200mAh battery, which can be fully charged in 1‑2 hours and can be used normally for about 15 days. 2. Safe Ultrasound: This barking control emits 25kHz ultrasound, which is above the range of human hearing, but easily grabs your dog's attention and makes them uncomfortable. 3. One Button Operation: You can stop bad behavior of your dog with just a touch of a button. Ultrasonic Bark Control Device is completely safe and harmless to dogs. 4. Outdoor Portable: This ultrasonic bark control device with wrist strap, handheld, fits your hand perfectly, convenient for walking your dog outdoors. 5. 16.5ft Control Range: Barking control devices train them for good behavior in public and keep them from unsafe food, and can also be used to stop dogs from approaching you. Specification: Item Type: Ultrasonic Dog Barking Deterrent Material: ABS Parameter: Battery Type: Polymer Lithium Battery Battery Model: 18650 Battery Capacity: 1200mAh (Included). Package List: 1 x Ultrasonic Dog Barking Deterrent 1 x Charging Cable1 x Manual1 x Lanyard