Features 1、Large Capacity Battery: The 300mAh lithium battery has a large capacity design, which has a larger capacity than most products, and can be used for up to 1‑3 days (60 days of long standby). 2、Operation Without Remote Control: The dog bark control collar works in automatic mode through a combination of sound and vibration, without remote control. 3、Adjustable and Durable: This vibrating and durable reflective nylon collar can be adjusted according to your dog's size. Suitable for all dogs from 6cm to 35cm in diameter. 4、Smart Barking Collar: Only the barking of your pet can activate the vibration. Prevent other dogs from barking to activate the collar and cause harm to your dog. 5、Adjustable Sensitivity: 7 sensitivity levels are provided for all possible barking volumes and different environments, ensuring that you can set the correct sensitivity. Select the mode (sound/vibration or sound+vibration) and sensitivity. Specifications: Item Type: Dog Barking Collar Material: ABS + Nylon Size: Approx. 6.5 x 2.5 x 3.5cm/2.6 x 1.0 x 1.4in Adjustable Range of Collar Diameter: Approx. 6-36cm/2.4-14.2in Battery Type: Lithium Battery (Included) Battery Capacity: 300mAh Charging Method: USB Charging Characteristics: 1. Simple and Elegant Appearance, Small Size, Equipped with Nylon Collar, Pets Can Wear, Easy to Wear. 2. with Life Waterproof Function, You Don't Need to Worry About Rain or Rain. Package List 1 x Dog Training Bark Stopper 1 x USB Charging Cable 1 x English Manual