This is the remote control for the iRobot Roomba 871 automatic vacuum cleaner, which is quite old. I've already disposed of the main unit, so I can't confirm if it works. I'm selling it as junk. It did work when I used it (about 7 or 8 years ago), but please understand that I'm not responsible if it doesn't work. The exterior has some scratches, marks, and dirt, but I don't think it will affect its use. There's some battery electrolyte (?), staining in the battery compartment. I'll wrap it lightly in a plastic bag and ship it via Yu-Packet Post or Yu-Packet Post Mini.