PFU's HHKB Professional HYBRID Type-S English layout / Sumi (Black) unprinted model keyboard. It adopts the Type-S key structure, which excels in Speed (high-speed typing) and Silent (quietness), and supports both Bluetooth and USB connections. With Bluetooth, you can switch between 4 devices with simple key operations. Since the keycaps are unprinted, I learned to touch type with this keyboard. I impulsively bought an HHKB Studio during a Rakuten sale and no longer need this one. It works perfectly. All accessories are included, including the original box. The HHKB Studio is inconvenient because it takes a long time to wake up from sleep mode, but I don't need two keyboards, so I've decided to sell this one to someone who can make good use of it. I will wrap the outer box in double layers of air cap (bubble wrap) for shipping.