811 3 Keys Laptop Mini Wireless Mouse Portable Optical Mouse, Spec: Battery Version (Beige) 1. Material: ABS, electronic components 2. Number of keys: 3 keys 3. Photoelectric resolution: 800-1200-1600dpi 4. Working mode: 2.4GBT5.2 5. Wheel direction: four-way wheel 6. Working distance: 10 meters 7. Battery: charging versiondual mode version: 500mAh lithium battery, battery version: AAA battery x 1 (battery is not included in delivery) 8. Wireless optical engine, accurate positioning, not easy to drop frames 9. Non-slip grille rollers, comfortable and wear-resistant, smooth movement, flexible operation 10. The shell is made of skin-friendly ABS material, which is anti-sweat and anti-fingerprint 11. Product size: 9.5 x 5.5 x 2.8 cm 12. Product weight: about 55 grams