New Pet Dog Repeller Anti Barking Dog Training Device Trainer LED Ultrasonic Pet Driver Aiding Pet Supplies Without Battery Description Easy to Operate,train all Kinds of Dogs such as that are Used as Pets, in Police and for Shepherding. Material:Plastic Color:Yellow Size:130*26*40mm Weight:64g 
Battery( not include!!!)
Please pay attention: you need install the 9V battery. Also, 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, Note: Do not deliberately tease the dog with the dog drive, because it is not surprising that the dog listens more.