Amazon.co.jp: SteelSeries 64830 Mini Gaming Keyboard, Mini Size, Apex 9 Mini JP, Wired Japanese Layout, Response Time 0.2 ms, Set Actuation Points 0.04 inches (1.0 mm), OptiPoint Optical Switch, Heavy Duty : Electronics
Amazon.co.jp: SteelSeries 64830 Mini Gaming Keyboard, Mini Size, Apex 9 Mini JP, Wired Japanese Layout, Response Time 0.2 ms, Set Actuation Points 0.04 inches (1.0 mm), OptiPoint Optical Switch, Heavy Duty : Electronics