This is the NEEWER 3-wheel wireless video camera dolly. It can be used to mount smartphones and video cameras for smooth and stable moving shots. It supports wireless operation and is ideal for product photography, video production, and vlogging. The 3-wheel structure allows for a variety of movements, such as straight lines and circular motions. It has been tested and confirmed to be in working order. This is a used item, so there may be minor scratches and signs of use. Please check the photos to assess the condition. The main unit has been tested and is working properly, but the remote control has some issues. Please understand this before purchasing.