1.Dog Bark Control & Pet Trainer: Dog Barking Deterrent Devices provide dog bark control and stop actions like digging, fighting, chewing furniture, eating unsafe foods, and other unwanted behaviors. The three gear ultrasonic channel has independent keys to switch freely: fixed frequency/interval frequency conversion/random frequency conversion Independent ultrasonic button and Beep sound button function, the effective acoustic distance can reach 10 meters 2.Safe for Dogs & Human: The ultrasound will not cause interference or harm to human, because human cannot hear these frequency bands, but dogs will be 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 for training. 3.LED Flashlight with Multi Settings: It is equipped with a strong 1W flashlight with constant bright colorful lights/burst mode Large battery capacity USB convenient charging for two hours Normal use up to 20 days Standby up to 140 days. Ultrasonic work indicator and power display LED. 4.Easy to Carry: Our dog repeller is small and light.You can put it into your pocket or bag and carry it anywhere,such as jogging or cycling.Our product is particularly suitable for outdoor work,outdoor travel and night security patrols,as well as various forms of dog training. 5.Satisfaction Guarantee: We strive to provide each customer with the highest standard of customer service to ensure you have a pleasant shopping experience. If you have any issues, inquiries or need assistance, please feel free to contact us directly. Product name: Ultrasonic dog driver Material: Plastic Color: Black Product size: About 140x35x35mm/5.51x1.37x1.37inch Battery: 1200mAH Power supply mode: USB Acoustic distance: About 10m/39.3inch It is small and can be carried with you. It can effectively drive away dogs when they are mad or wild dogs Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. included: 1 x Dog Repellents 1 x Data cable 1 x Instructions