Main unit with a 9 volt battery only - Used item, it is sold as pictured, please STUDY MY ACTUAL PICTURES of this item to see what?s included and it's overall condition . Do your research before buying to be sure it's what you need, there is a restocking fee for my items. If you have any questions, please contact me BEFORE buying. Pay attention to the posted estimated delivery time, all my items are shipped USPS SIGNATURE REQUIRED UPON DELIVERY for security. Please buy accordingly, Thanks