The dog bark suppressor is more effective, people and dogs can hear a wider frequency range, from 15Hz to 120kHz. This bark tester emits 25kHz ultrasonic wave, which is higher than human hearing range, but easy to attract dogs' attention. and they don't feel well. button to stop your dog's bad behavior like barking, digging, fighting etc. to help them understand their Rechargeable Dog Bark Control Device with Low Power Indicator This Sonic Bark 1200mAh USB rechargeable battery lasts about 30 days, saving you endless money and invests in batteries when low, indicated by pressing the function key. The light turns red. Convenient for outdoor use 16.5ft 16.5ft bark control range fits your hand perfectly and comes with an adjustable wrist strap. dangerous foods, you can also use it to prevent dogs from coming to you This product is designed with a super bright flashlight, the light can reach 60 meters, suitable for outdoor use . It can be long, flash and sos-flash. Recommendation: Different dog breeds may react differently to ultrasound. For best results, once your dog stops barking or behaving in an unwelcome manner, praise and reward him to let him know what we expect of him.