【Rechargeable Dog Barking Deterrent Device】: Our rechargeable dog barking control device built-in 2000 mAh rechargeable battery can be used for up to 40 days on a 3~4 hour charge. and it comes with a USB charging cable that works with computer ports, portable mobile power and existing USB power adapters. 【Anti Bark Device Outdoor & Indoor】: Our ultrasonic anti-barking device not only compact and portable, easy to install, but also has IPX4 waterproof housing, it can be placed anywhere in your home or yard, and can also be hung outside on a tree, wall or garden fence. easily helping you solve your dog's barking problem while eliminating the interference of weather factors. 【50FT Effective Range Bark Stopper】: Our dog barking device has 3 adjustable frequency modes for different sizes and personalities of dogs, they can be used both indoors and outdoors, The dog deterrent devices can emit up to 50 feet range ultrasonic sound waves to stop dog barking, not only suitable for stopping your dog barking but also for stopping your neighbor's dog from barking excessively. This no bark device creates a quiet space for dog lovers and stops unwanted barking behavior.