PFU Happy Hacking Keyboard Professional JP Japanese USB keyboard Capacitance non-contact N key rollover Black Product weight:762 g Product Dimensions: 32.6 x 15 x 5.6 cm Manufacturer's part number: DDD1-PD-KB420B Dimensions Height  width of the product : 11 x 40 mm Corresponding OS: WindowsVista/XP/2000/Me/98, (I except the 5.0 but) MacOS8.6 ~ 10.5