iBUFFALO Wireless (2.4GHz) Keyboard & Silent Mouse Set Model Number: BSKBW100S Color: Black Keyboard: 　Batteries Used: AAA 　Size: Approximately W45cm x D12cm Mouse: 　Batteries Used: AA 　Sensor Type: Optical This is a sale of the main unit only. No instruction manual or batteries are included. The receiver is stored on the underside of the mouse. The mouse battery cover is a little stiff to open and close, but this has been the case since purchase. I think it's relatively clean as it hasn't been used much. -------- *Please understand that this is a used item before purchasing. *Instant purchase is OK. *We cannot offer discounts based on requests. *We will prioritize the person who purchases first, even if we are responding to comments.