Quantum QHM8810 Keyboard with Mouse (Black) Ultra slim and long life due to scissor-key structure compact size for space saving key pressure:55g, comfortable feeling. Effectively reducing typing stress, release the arm muscle. Strain noiseless design achiever undisturbed working environment. Dimension: 462x180x20mm. Life-span of operation: 10,000,000 times Compatible with Windows 98/2000/ME/NT/XP/Vista/WIN7.