Product Features: 1. Built-in pickup to detect dog barking 2. Voice-activated horn, which generates ultrasonic waves and emits 3. Digital display, charging model 4. There are 4 ultrasonic frequencies to choose from. For different types of pets or animals, ultrasonic waves are more effective to stimulate 5. The sensing distance can be selected, the sensitivity can be adjusted, and the best suitable gear can be set according to the use environment. 6. The product shell is anti-ultraviolet, and the shell is not easy to fade. 7. The ultrasonic power is increased, the coverage is wider, and the ultrasonic stimulation is strong. 8. IP45 waterproof level 9. Working distance: 50ft/15m 10.15/20KHz frequency is most commonly used to stop barking in dogs How to use it : Charging the collar :To charge the device ,Plug the black USB charging cable that is supplied into the bottom of the device and connect it to either a Laptop , PC or power supply that is2 amp. The device can be charged in three hours and will work continuously for 30 days . When charging the device ,the digital display will show the power level and continue to flash until it is fully charged .When the product is fully charged ,the digital display will show a 4 . Before turning on the device unplug the USB charger. Turning the device ON-OFF To turn device ON press the POWER button down for 3 seconds and it will beep once with the digital display flashing a green number which will then disappear . To Turn device OFF press the POWER button down for 3 seconds and it will beep twice and turn itself off. Settings: The digital display shows the levels of sensitivity and Frequency.You can choose to adjust the sensitivity from 1-4 by constantly press the Sensitivitybutton . Level 1 is the least sensitive and level 4 is the most sensitive.You can choose to adjust the ultrasonic Frequency from 1-4 by constantly press the Frequencybutton. Level 1-ultrasonic Frequency 15KHZ ,digital display 1 with 6seconds Level 2- ultrasonic Frequency 20KHZ ,digital display2 with 6seconds Level 3- ultrasonic Frequency 30KHZ ,digital display3 with 6seconds Level 4- ultrasonic Frequency will emit for 1-3 level 3 different ultrasonic frequency sounds with 6seconds ,digital display 4.