Specifications:1. Brand: HYSJ2. Model: X503. Mouse type: Wireless Optical Mouse4. Frequency: 2.4GHz5. Button: 66. Interface: USB7. Material: ABS8. Color: black / red 9. Battery: 2 x AAA Battery10. Item weight: 65g11. Item size: 11.7 x 6.55 x 3.8cmFeatures:1. Wireless transmission, the longest sensing distance up to 10-15 meters.2. Portable and weight light, very convenient to carry and store.3. Power switch for saving power.4. With 6 Keys, including Scroll Wheel, Page Forward and Page Backward buttons for easy Internet Surfing.5. Resolution: 1000DPI, 1200DPI,1600DPI, 2400DPI (adjustable)6. Mini adapter Plug and play.Package included:1 x 2.4GHz Wireless Portable Optical Mouse (Battery not included)1 x USB receiver