Adjustable: When the sensor detects the dog's own sounds, it will automatically activate warning sounds, vibration and electrostatic shock, and can be adjusted to 0-7 levels of vibration, shock and detection. Safety and Reliability: Adopts intelligent dual-mode detection system, the sensor is inspired when the dog blows on the collar and triggers the collar body. In addition, when activated 7 times per minute, the training collar will enter automatic protection mode, ensuring that your dog can wear it safely. USB Rechargeable: Built-in 2800mAh lithium battery, fully charged quickly with USB in 1-2 hours, and can be used for about 10-15 days Applications: The collar is adjustable from 3.5 to 21.7 inches (9 to 55 cm), so it is recommended for dogs weighing 11.0 to 99.3 lbs (5 to 45 kg). Waterproof: IPX7 waterproof