【Deterrent Mode & Training Mode】This rechargeable bark control device features both training and deterrence modes, using varying ultrasonic wave frequencies to meet a diverse range of training needs. It is highly effective in preventing undesirable behaviors such as barking, fighting, and scratching.【33FT Effective Control Range】Hanience anti barking device designed with dual ultrasonic sensors offer accurate directional control and a stable effective range of up to 33 feet, making it easy to train your puppy both indoors and outdoors.【Safe to Pets & Humans】 This anti-barking device operates at an ultrasonic frequency range of 20-25KHZ, imperceptible to the human ear, ensuring a peaceful environment. The device's reach encompasses the dog's hearing range without negatively impacting their hearing or overall health. Suitable for small, medium, and large dogs aged between 6 months and 8 years, it presents a safe and effective solution for bark control.【Safe Nighttime Activity】Dog bark deterrent device is equipped with a flash mode and handheld light mode to ensure visibility at night, ensuring maximum safety during training sessions. Press the side switch to enter the lighting mode.【Easy to Use】The bark repeller, which can be conveniently charged using the included Type-C cable through various devices like power banks or laptops, is both lightweight and portable. To use it, you just need to turn it on and press either the deter or train button. It's operationally simple, making it user-friendly.