Description: Universal Fits – This dog dark repeller uses ultrasonic sound that works effectively to reduce excessive bark of dogs, but out of humans hearing range, Ultrasonic Repeller - You can uses it to correct inappropriate behavior for dog training. 3-level Sensitivity - It depends on the range from the barking dog, you can choose to set it into low Sensitivity(up to 15ft)/Medium Sensitivity(up to 30ft)/High Sensitivity(up to 50ft). Safety Tested - It will not be harmful for human, very safe for the pregnant, kids, the old. Portable & Water Resistant - Compact size, can be free standing and hanging with handles for indoor or outdoor uses. Specification: Material: Plastic Color: Black Size: 8x4.4x5.4cm/3.15x1.73x2.13 inch Package Includes: 1 Piece Dog Sonic Trainer 1 Piece USB Cable Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-3mm differences due to manual measurement.