Features 1、Safe for You and Dog: This anti barking device will be a safer and gentle training option, which is safe for both you and dogs. Ultrasound does not cause interference to you because you cannot hear these frequency bands, but dogs are sensitive to these ultrasounds. However, some dogs may be afraid or dislike this sound and will not stop barking at first, so please allow up to 2 weeks of training time. 2、Better Training: The barking deterrent device can emit 22‑26khz ultrasound to control barking and prevent behaviors such as digging, fighting, chewing furniture, eating unsafe food, and other unwelcome behaviors. 3、With 3 Modes: The portable anti bark device has three modes of chase, training, and lighting, please press the knob to different modes to achieve the best effect. 4、Premium Design: The dual sensor anti barking device can emit two different types of ultrasonic waves, training mode at 22Khz and chaser mode at 26Khz, to avoid dogs getting used to simple frequencies, with an effective range of 33ft. You can use it to training dogs or scare them away. When you press the button of this ultrasonic anti barking device, the LED lights will flash together, giving the dog the most effective deterrent force. A bright flashlight can also be turned on to illuminate your way home. 5、Easy to Carry and Use: The portable barking control device for controlling barking is very small and can be comfortably placed in your hand or pocket, making it easy to carry. This allows you to training your dog in wider areas such as parks, grasslands, beaches, etc., while also preventing unfriendly dogs from approaching you outside. Specification Item Type: Ultrasonic Dog Trainer Material: ABS Battery: 1 x 3.7V battery with 1200mAh capacity, shipped with built in battery. Package List 1 x Ultrasonic Dog Trainer 1 x USB Cable 1 x User Manual 1 x Lanyard