The SportDOG Yard Trainer SD-105 is a waterproof dog training collar that uses both vibration and static/shock control methods. It is designed to help train dogs and correct unwanted behaviors. The collar is made by SportDOG, a well-known brand in the pet supplies industry. The product is new and comes in an open box. I opened the box due to previous models having issues and wanter to test to make sure it worked and it worked great! Put right back in the package after.