Specifications:

• EXTRA LONG EFFECTIVE DISTANCE AND MULTIPLE MODES: Our anti barking device has three adjustable modes. Mode 1 (30khz): suitable for small dogs; Mode 2 (20khz): suitable for more docile dogs; Mode 3 (15-30khz): more suitable for large dogs or active dogs. Of course, you can also switch to the mode more suitable for your dog according to the actual situation.
• INSTRUCTIONS of US: Simply rotate to the corresponding channel as needed. Each product comes with a manual. When the blue light flashes, it indicates that the has detected barking and is working. When the red light flashes continuously, it indicates that the product needs to be charged.
• REECHARGEABLE: We come with a charging cable, please charge it before use. Our automatic anti-bark device will last up to 30 days on a 4 hour charge (actual length depends on how often your dog barks). Our sonic anti-barking device can be easily hung on a garden fence, tree, table or dog house and is very handy for preventing your or your neighbor's dog from barking. Simple to operate and easy to use, it's a friendly anti barking dog device for your furry friend.

Anti Barking Devices, 32FT Effective Range and 3 Adjustable Modes and 3 Sonic Emitters, Rechargeable Ultrasonic Bark Box Dog Barking Deterrent Devices, Suitable for Indoor Outdoor