Dog Trainer - This bark control device helps with dog training and behavior aides. The bark stopper has 2 ultrasonic modes with a frequency of 23-30 kHz and is also equipped with a sound mode. Plus, the blinking flashlight on the top can get your dog's attention. 3 Times the Power - Our anti barking device is the first on the market to have a triple emitter, meaning the ultrasonic comes out of 3 spots on the dog barking control device. This device has a range of 49 feet and can be used to train dogs sized 5-120 lbs that are 6 months to 8 years old. Ehanced Safety Features - The dog barking deterrent has an auto-off feature that shuts off the anti bark for dogs after 10 seconds. The ultrasonic dog bark deterrent also has an added torch light that shines as bright as 33 feet ahead of you for nighttime walks. 100% Portable - The no bark device weighs 5 oz. A wrist strap is included on the ultrasonic dog repellent for more convenience. The ultrasonic dog trainer runs on a 450 mAh battery and works for up to 14 days without charging.