Dog Barking Stop Device &ndash; CLOSE OUT SALE - Stop Dog Barking with Ultrasonic and Voice Command - For Inside and Outside- Day or Night &ndash; Safe and Eco Dog Friendly - Lightweight 23 &frac12; &ldquo; Adjustable Collar - Fits Medium to Large - Bonus Ebook "Train Your Buddy to Become Your Best Buddy" Fits medium to large size dogs - 23 1/2" collar Safe and Eco dog friendly  No Shocking 3 Working Modes  Ultrasound - Audio - Ultrasound and Audio - Specifically Calibrated for a Dog's Hearing 6 seconds to record your own voice commands Bonus Ebook Gift - Train Your Buddy to Become Your Best Buddy