DOG REPELLENT ULTRASONIC ANTI-BARK Feature: Light and cute: the dog trainer is lightweight and has a nice design, making it an excellent choice do keep the bark outside for dogs. Not recommended do indoor use. Adjustable design: ultrasonic dog barking repellent makes a harmless but effective sound to control excessive barking, ideal for small, medium and large dogs. Powerful Features: This ultrasonic barking control device can catch your dog barking in the area covered by the system, stopping your own dog or neighbor's dog barking. Simple installation: dog bark stopper can be easily hung on trees, walls or fence posts. Add some do style to your outdoor decor and bring peace to family and neighbors at home and camping. Material ABS: barking control device adopts high quality ABS material, which is waterproof and durable and can withstand various weather conditions. Specification: Item Type: Ultrasonic Dog Bark Repellent Material: ABS Parameter: Battery Type: Lithium-Ion Battery Battery model: 18650 Battery capacity: 1500 mAh (included) List of packages: 1 x ultrasonic dog bark repellent 1 x User Manual 2 x expansion tubes 2 x Screws