Check the listing for details. Ultrasonic Anti-Dog Bark Deterrent Device Stop Barking Repeller 4 Mode with LED. Color: Black+Orange, Condition: New. Listed at 29.99 USD. Safe & Humane - Ultrasonic dog bark deterrent can emit a flexible ultrasonic frequency in the range of 20 ~ 30KHz. It is effective pet corrector for dogs of all types and sizes of age 6 months to 8 years old. 4 Magical Modes - Choose from three modes - Stable Wave, Jump Wave, Sound Deterrent Mode and Cyclic Variable Frequency Plus Flash. Built-in LED Flashlight - Not only can bright LED lights illuminate your path, but the flash mode can also act as an additional deterrent. Fast charging & Long-lasting Battery - Dog barking deterrent with a built-in 1200 mAh Li-ion rechargeable battery and fastest Type-C Charging port. Safety Design - Incorporates 8s auto shut-off technology to protect the hearing safety of all breeds and sizes of dogs.