Description: 3-in-1 Dog Silencer & Pet Trainer: With an ultrasonic releasing mode, a beep training mode, and a LED flashlight mode, provides a safe, effective solution for training, bark control, and all of your pup's unwanted behaviors. Equipped with 3 different frequency sound waves, stable frequency, undulating frequency, and irregular frequency sound waves to ensure dogs do not get used to a certain frequency. Grab your dog's attention by simple point and click. Portable stop dog barking device is rechargeable(with a standard USB included in the box) 300mah battery for up to 12 days of use without charging it again. And its standby time is up to 15 days in charging of 1-2 hours only. The range of ultrasonic penetration is 25ft, covering the area indoor and outdoor. You can easily train the dog's behavior by turning on the knob. The dog deterrent device is not applicable to the following situations: aggressive dogs, noisy surroundings, hearing impaired dogs, dogs under 6 months or over 8 years. Specification: Material: ABS Plastic Size(LxWxH): 120x31.2x34.3mm/4.72x1.23x1.35inch Power: USB Input Voltage: 3.7V Battery: 300mAh Sensor: Sound Detection Sensor Distance: Up to 25ft Ultrasonic Frequency: 20KHZ-25KHZ Package Includes: AS YOU CHOOSE 1 Piece Dog Repeller or 1 Piece Dog Repeller 1 Piece Whistle Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!