MARDOG No Bark Collar for Small, Medium, Large Dogs &ndash; Upgrade 2018 &ndash; Stop Barking Collar with Vibration and Sound &ndash; Humane and Safe for Dogs and 100% Waterproof Design HARMLESS, HUMANE, QUICK RESULT: The bark collar is designed to continuously use vibration and beeping sounds whenever your dogs bark. Soon, your canine friend will be taught that only by stopping barking, he/she can get rid of annoying vibration and sound. FIT ALL SIZES: No matter if your canine friend is a small Chihuahua or even a great Alaskan Malamute, the no bark control collar is effective for all sizes from 11 lbs up to 150 lbs. Easily to adjust and very light, your dog will hardly notice the collar. NEW INTELLIGENT CHIP AND UPGRADE 2018: New advanced technology in smart sensor is applied to MARDOG . With the new sensor, the anti bark collar can only be triggered by your dogs sound, which will not be affected by another dogs or human noise. WATERPROOF DESIGN: Using the latest technology, Mardog no bark collar allows your furry friend to play in splash water, rain or even in snow. SATISFACTION GUARANTY: Within 60 days of use, if there are any inconvenience and you dont love our MARDOG collar, your money will be fully transferred back to you.