Oternal Electronic No Bark Control Dog Training Collar with no Harm Warning Beep and Shock, Red Nylon Collar for 30-120 Pounds Dogs This advanced anti-bark dog collar sends harmless warning beep( tone) and static shock to the dog whenever it barks, keeping a quiet environment at home/ indoor With full automatic controlles, the stimulations of the collar repeat through 7 correction levels, the intensity increases gradually, till the dog stops barking for thirty seconds. If the stimulus reaches the 7th correction level continuously, the collar will get into dormant state for 1 minute to protect the dog Sensitivity switch is adjustable for different conditions, such as different sizes of dogs and dogs barking as well as specific environment. The more sensitive, the easier to make it trigger Not waterproof, Lightweight receiver, Replaceable 6-volt battery, Red nylon strap with 29.5 inches length Main effective for the 30-120 pounds dogs. Don't encourage you to use it for puppy, especially below 25 lbs, the collar is a little large for the puppy/small dogs and the stimulation will be a little strong