Brand Name: NoEnName_Null Battery Included: no Type: 2.4Ghz Wireless High-concerned chemical: none Origin: Mainland China Operation Mode: Opto-electronic Hand Orientation: Right DPI: 1600 Certification: NONE Number of Rollers: 1 pcs Number of Buttons: 6 Interface Type: USB Power: 2*AAA Battery(not included) Color: Black Red Gray Blue Choice: yes semi_Choice: yes