Brand Name: CHYI Battery Included: No Type: 2.4Ghz Wireless Hign-concerned Chemical: None Origin: Mainland China Operation Mode: Opto-electronic Hand Orientation: Right DPI: 1600 Package: No Power Type: Battery Style: 3d Style: DPI adjust button Time to market: Dec-04 Certification: CE Number of Rollers: 1 pcs Gross Weight: 110 Number of Buttons: 5 Interface Type: USB Dimension:: 125*65*82 mm Adjustable DPI: 800-1200-1600 Color: Black Application: Laptop,Desktop,For Home Use,Laptop,For Video Game,For Office Use Tracking Method: Optical Item: Ergonomic Vertical Mouse Type1: Wireless Left Hand Computer Gaming Mice Name: 5D USB Optical Mouse Gamer Package: PE Bag Type2: Wireless Right Hand Computer Gaming Mice