Charging: ? USB Charging Only. ?Charge for 3 hours, work for 30 days(On standby).The higher the sensitivity and the higher the frequency, the faster the battery will drain, so you need to charge it when it is low. You can turn it off if necessary. ?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. ON-OFF: ?To turn device ON: Press the POWER button down for 3s 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 3s and it will beep twice and turn itself off. Frequency Settings: ?You can choose to adjust the sensitivity from 1-4 by constantly press the Sensitivity button. According to the received dogs barking sound level and distance, trigger the ultrasonic start. ☞Level 1 Ultrasonic Frequency 15KHZ, digital display 1 with 6s ☞Level 2 Ultrasonic Frequency 20KHZ, digital display 2 with 6s ☞Level 3 Ultrasonic Frequency 30KHZ, digital display 3 with 6s ☞Level 4 Ultrasonic Frequency 15KHZ-30KHZ, it will emit for 1-3 level 3 different ultrasonic frequency sounds with 6s, digital display 4 Specification: Product Name: Barking Control Device Power: USB Input Voltage: 3.7V Input Current: 40mAh Battery: 1500mAh Rechargeable Batterie Waterproof IP Rating: IP4 Sensor: Sound Detection Sensor Distance: Up to 50ft Ultrasonic Frequency: 15KHZ-30KHZ Package: ?1 * Anti Barking Device ?1 * USB charging cable ?2 * Mounting Screws and Anchors ?1 * User Manual