Feature:1.The low frequency of this product can be heard by dogs, which can effectively prevent the barking of other vicious dogs and protect your personal safety2.This product can also be used to train disobedient dogs to become well-trained3.Do not deliberately tease the dog with the dog drive, because it is not surprising that the dog listens moreSpecification:Origin: CN(Origin)Applicable: DogModel Number: Anti Barking devicePowered by: 9V battery (not included)Feature: Ultrasonic with LED FlashlightPackage:1 x 1 pcs Anti Barking Training DeviceNote:1.The following conditions do not drive dogs well:1. The dog you own, because it knows that the owner will not hurt it;2. Noisy environment, such as downtown or roadside;3. Dogs with the owner-dog-dominant; trained large dogs-well-trained;4. When the battery voltage is too low-the transmit power is low.The above situation will not affect the use of this product, because your own dog, dogs who often shop, dogs with the owner and well-trained dogs will not bite randomly; .2.Please allow 1-3mm error due to manual measurement. please make sure you do not mind before you bid.3. Due to lighting effects, monitor's brightness contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item!