Powerful Ultrasonic Technology: Equipped with high-frequency ultrasound ranging from 30,000Hz to 40,000Hz, this device effectively stimulates the hearing of aggressive dogs, creating a deterrent effect. Easy One-Button Operation: Effortlessly drive away dogs from up to 8 meters with a simple press of a button, ensuring and reliability in close encounters. Long-lasting Type-C Charging: Featuring a built-in rechargeable battery and Type-C charging, this device offers extended usage time, removing worries about frequent recharging. Compact and Portable Design: The mini size makes it easy to carry and convenient to store, while the included lanyard ensures it/u2019s always within reach, ideal for everyday use. User-Friendly Minimalist Design: With its straightforward one-button operation, this device is accessible for all ages, making it suitable for both children and the elderly to use confidently. Product Name:Barking Deterrent Device Size:3x2.6x5cm Battery:3.7V 300mAh Effective distance: 8 meters away Audio frequency: 30000-40000Hz Target audience:Dogs Colour:Black Material:Plastic Package Contents: 1 * Barking Deterrent Device 1 * Lanyard 1 * Data cable 1 * English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.