Specification Product name: Anti Barking Device Power: USB Input Voltage: 3.7V Input Current: 40mAh Battery: 3.7V 1500mA ICR18650 NH Waterproof IP Rating: IP45 Sensor: Sound Detection Sensor Distance: Up to 33ft Ultrasonic Frequency: 10KHz - 25KHz Function: 1. SAFE AND EFFECTIVE The anti-bell for dogs is an innovative solution for barking dogs and correcting unwanted behavior. ;The ultrasonic dog training device is safe and effective for all types and sizes (5-120 lbs) of dogs. ;Suitable for dogs from 6 months to 8 years. 2. Wide Working Range This new ultrasonic version is suitable for outdoor use with a range of 33 feet. ;The dog barking deterrent device is great for stopping neighbouring dogs or homeless dogs barking near your home, creating a quiet living environment for your family. 3. 15 DAYS LONG WORKING TIME:This bark control device only needs 5 hours full charge and can work 15 days, standby time:30 days 4. 3 different frequency waves to prevent dogs from getting used to simple frequencies: this ultrasonic dog bark deterrent can emit ultrasonic sounds with 3 different sound waves, a stable frequency, a wavy frequency and irregular frequency sound waves. 5. Dog Muffler & Pet Trainer - Dog Barking Deterrent Devices provide control over barking