New in Box; I charged it to verify it is in working order. This collar is the best protection money can buy for your beloved pet. Halo was up front about it’s sizing parameters & I knew it would be too big for my 7lb. Cavapoo, Riley, but I had to try. She is just too small for it to fit properly. I cannot stress enough how effective I know the Halo to be. It currently protects 8 dogs in my neighborhood alone. The Halo Collar 2+ has built-in advanced GPS/GNSS technology so you can create the most accurate wireless dog fences with the tap of a finger in the Halo app. Save up to 20 unique, installation free wireless dog fences for less than the cost of one in-ground wire fence. Your fences can be the perimeter of your backyard, property line, your go-to dog park, or favorite dog beach, etc. In just minutes on the Halo App, you can create a fence at your parent’s home while visiting for Christmas or at your vacation rental for summer break. You can create a safety perimeter/fence literally anywhere. Once your wireless fence is saved & synced, your dog’s collar automatically guides them to stay inside of it - so no need to worry about wi-fi or cellular interruption affecting the boundaries you create.