3D Optical Mouse, M/N: A-103 Key features & Specifications: 1. Comfortable shape for easy handling 2. Optical technology for precise tracking, no cleaning required 3. Resolution: 800/400dpi 4. work on any surface except glass or mirror 5. 3 buttons & a scroll wheel, supporting PS/2, USB or USB+PS/2 combo interface 6. Various color shells available 7. Retractable USB cable available 8. Power rating: 5V, 100mA max 9. Operating Force:75+/-20gm 10. Dimensions: 96*51*33mm 11. Weight: 60g