✓? Rechargeable-IPX4 Waterproof - This bark control unit is equipped with a USB data cable, fully charged for about 5 hours, and can be used continuously for up to 5-7 days. And with a working indicator light, you can easily check the working status of the battery. When the 3rd gear is working, the indicator light on the anti-bark device flashes blue every 6s; when the dog barks triggers the anti-bark device, the red light stays on for 3s; when the battery is low, the red light flashes. ✓? Multiple Hanging Hole Design - There is a small rotatable hook at the top and rear of this bark suppressor, which can be hung on trees, walls or fences; there are 2 holes embedded in the rear of the body, equipped with a punching device, easy Install. ✓? Dog Painless Training - Adjusting The Frequency Of The Anti Barking Device Every Week Can Maintain The Training Effect. Level 1 - Variable Frequency (15-30khz). Class 2 - 20khz Frequency. Class 3 - 30khz Frequency. Off - On/Off Switch. You Can Choose The Appropriate Mode According To The Specific Situation Of Your Dog To Achieve The Best Effect. (Not Suitable For Hearing Impaired Dogs And Will Not Work On Two Or More Dogs At The Same Time.). ✓? 33ft Effective Range - This Dog Bark Control Device Has A Wide Effective Working Range Of 33ft, Perfect For Stopping Neighbors And Homeless Dogs From Barking Outdoors. (33ft Refers To The Barrier-Free Space, If There Are Obstacles, The Effect Will Be Reduced~) Tips:It can take 2 weeks to work(Before that, it takes time to train your dog with the equipment.). ✓? Humanized Controlled Dog Bark Device - This Anti-Bark Device With The Latest Dog Bark Sensor System Can Accurately Capture Dog Bark. Safe For Pets And Harmless To Humans, The Bark Stopper Automatically Emits Ultrasonic Waves To Stop Your Dog From Barking, Perfect For Keeping Your Dog Quiet When You Are Away, Creating A Quiet Community For Your Family And Neighbors.