Do you or your neighbour's dog often make unnecessary bark to disturb your peace? Do you want you to enjoy the peace of mind again? If your answer is yes, the ultrasonic bar control will be your best choice. The 100% safe device releases ultrasound to effectively silence your dog. About Turning the Device ON/OFF To turn on the device, press and hold the “POWER” button for 3 seconds. When you hear a beep and see a flashing green number, it will indicate that the device is turned on, after which the number will disappear. To turn off the device, press and hold the “POWER” button for 3 seconds until you hear two beeps and turn off the power. 4 Modes of Sensitivity Settings You can adjust the sensitivity from 1-4 by pressing the sensitivity button. Level 1 is the lowest sensitive and level 4 is the highest. Level 1- Ultrasonic Frequency 15KHZ, digital display 1 with 6 seconds Level 2- Ultrasonic Frequency 20KHZ, digital display 2 with 6 seconds Level 3- Ultrasonic Frequency 30KHZ, digital display 3 with 6 seconds Level 4- Ultrasonic Frequency will emit for 1-3 level 3 different ultrasonic frequency sounds with 6 seconds, digital display 4. Package includes 1* Ultrasonic Bark Controller 1* User Manual 1* USB Charging Cable 2* Mounting Screws and Anchors