Are you desperate when you find out that the specific battery for your pet¡¯s collar is suddenly dead and you can not get a replacement battery ?This collar uses normal AAA battery that is available everywhere.Did you feel guilty when your dog was hurt because the collar will active by any noise ?This collar will never mis-judge your dog"s behavior.BK208 is the newest anti-bark collar with the most intelligent system. The Bark Control Collar is controlled by a microprocessor which distinguishes your dog¡¯s bark from other environmental noises and automatically delivers ultrasonic and/or static shock after each bark. The collar can effectively and humanely stops barking when it is worn on big dogs.How the BK208 bark control collar works An internal microphone picks up the sound and the unit is automatically activated. The bark control collar starts with emitting an ultrasonic sound of 1 second as a warning at the first bark. At the second bark the collar emits an ultrasonic sound of 2 second. From the third bark the collar emits a 3 second ultrasonic sound and gives 2-3 seconds static shock. The dog should stop barking. If the dog barks within 1 minute after the first static shock, the collar sends out a 3 second ultrasonic sound and 2-3 second of static shock. If the dog stops barking, the collar resets itself to the lowest level and repeats the first 3 steps. The shock levels can be adjusted with the delivered screwdriver.contentsBark controller X1Adjustable Nylon Collar X1Standard AAA/1.5V X2Contact points X2Battery capacity tester X1Special screwdriver X1