Review on Dr.Trainer B1sPro Bark Collar: APP & Watch Control, Waterproof, Customizable Settings, Rechargeable & Humane - with Barking Record & Progressive Mode by Angie Hernandez

Works very well on my adult border collie. I like that you can easily change the noise, vibration and/or shock level. You can add your own voice for personalized verbal correction. The only downside is that the software can be buggy when trying to change user settings and the collar can be buggy when you turn off the device. The collar has multiple tabs to allow the collar portion to pass through the various layers. **** 4 Month Update: The collar was only reliable for 1-1/2 months then became very buggy when turned on or off. . Now it won't turn on or off, the green light is flashing intermittently so it's kind of on but not quite. Purchase at your own risk. Had I known I wouldn't have bought it, waste of money.