2.4GHZ Wireless ergonomics optical mouse Feature-High Precision Optical Mouse -1200 DPI Optical Engine-10 Meter Connection Length-Battery 1xAA For Mouse (not included)-USB Nano receiver-Can Enter Auto Sleep mode, Which Can Also Save Battery Life-System Compliance Windows 7/8/10-10 m transmission distance(ไม่มีถ่านแถมมาให้นะค่ะ)