BC-50 Replaceable Battery CollarSafe, affordable bark control, with the same auto-set technology as the BC-200. Uses a 6 volt alkaline camera battery. Guaranteed to control nuisance barking, quickly and humanely. Now with new auto-set technology that adjust the collar's stimulus to suit your dog's unique temperament. The first bark triggers the lowest of 7 levels of stimulus followed by a 2 second relaxation period. If the dog continues to bark, the stimulus is raised progressively until the dog stops barking. A 5 minute period without barking causes the collar to reset back one level. Triggered by vibration so only the dog wearing the collar can set it off. Detailed Product Specifications Please note, if you live in NSW you can legally use this product with veterinary permission. Please ensure you have discussed the use of this product with your veterinary surgeon prior to purchase and use Please note this products will be shipped directly to you from our supplier and will arrive seperately to you main order.