MECO(TM) New USB Wired Optical Scroll Wheel 3D Mice Mouse For Laptop PC Notebook Computer (01Black) Power: 1 x AA battery (not included) MECO Brand which has been registered in many countries and regions in U.S(Registration, No.86280497 )Please look for " MECO Authorized " when making purchases to get original MECO products,MECO products are all special produced with exquisite workmanship & high technology,And all comes with our Brand accessories in MECO packing. Therefore, please DO NOT follow MECO listings without Authorization, or We will be forced to taking legal actions available to protect and enforce our rights. Mouse size: 104x62x25mm;USB dongle size: 20x14x6mm Resolution: 800 to 1200DPI