Noise-Reduction Keycaps.  Compatible with Windows 2000, XP, VISTA, win7, win8, win10, etc.  Voltage /current: DC 5V/<30mA, 415+-20g, (L)438.5mm x (W) 132.4mm x (H) 27.8mm.  If you  have any questions email us and we will get back to you as quickly as possible.