Feature: 1. The lithium battery is designed with a large capacity of 300mAh, which has a larger capacity than most products on the market, and can be used for up to 1‑3 days. 2. The dog collar has a digital automatic code matching memory function and easy‑to‑read blue digital display, which is with sound, vibration, sensitivity and power. 3. 3‑step adjuster, which can adjust the static electricity, vibration and sensitivity of the receiver, you can adjust it according to your pet's personality and size. 4. Lighter styling design of this collar can be wore without pressure by no matter large, medium or small dog. You won't have to worry about the sizes. 5. High‑quality nylon strap with reflective stripe, which can increase the safety and visibility of the dog. You can find your dog in the dark environment. Specification: Item Type: Dog Training Collar Material: ABS Battery Type: Lithium Battery (Built-in Battery Shipped) Battery Capacity: 300mAh Product Size: Host: Approx. 6.5x2.5cm/2.6x1in Dog Training Bark Stop Collar Length: Approx. 55.5cm/21.9in Color: Red. Package List: 1 x Dog Training Collar1 x USB Charging Cable1 x Test Light1 x English Manual Note: 1. Please read and follow the instructions in this manual. It is important to wear the collar correctly. When pets wear collars that are too long or too tight, they can cause skin damage. Wearing too long or too tight may cause stress and cause skin damage. This is often mistaken for burns.2. Don't tie the device tightly around the dog's neck.3. Do not leave the device on the dog for more than 8 hours.4. Replace the collar on the pet's neck every 1 or 2 hours. Please allow slight deviations due to manual measurement.