This Dogtra dog collar is a no-bark collar and is designed for small to medium dogs with a smaller receiver 

• The collar will recognize the dog's bark and not surrounding noises to activate stimulation
• Has a pager/vibrating warning before stimulous is released to the collar
• Six levels of stimulation to set depending on the sensitivity of your dog
• Made for dogs as small as 10 lbs (Collar weighs 4 ounces)
• Battery charges in under 2 hours
• waterproof