Purchased on Rakuten for 1,980 yen. The back side is a little dirty. Operation confirmed. The key feel is a light, clicky touch. Please note that the Enter key is small. It will be shipped in a paper bag with a waterproof bag and cushioning material. Quoted from the official website below: [Supported Systems] Windows, Mac, Android, iOS [Thickness] 0.6cm [Size] W247mm, D150mm, H6mm [Battery Life] Full charge in 3 hours. 100 hours of continuous use [Connection Method] ① Turn ON the power button in the upper right corner, confirm that "Power" lights up and then turns off. ② Press the Fn button on the far left and "Connect" in the upper right corner simultaneously. The "wireless" mark will flash. ③ Go to the Bluetooth settings screen of your device. Turn on Bluetooth, and [Bluetooth Keyboard] will be displayed, select it and the connection is complete. Connection type: Wireless (Bluetooth)