I was planning to buy the main unit later, but I ended up not buying it, so I'm putting it up for sale. It has been opened once to get the warranty card stamped, but it is completely unused. In the unlikely event of a defect, please contact the manufacturer's customer center listed on the warranty card directly. Although it is an unused item, it has been in someone's possession once, so please refrain from purchasing if you are overly concerned about this.