ELSRA USB Wired Programming Keypad Control Pad Black PK-2068 (23 Keys, 2-Layer Programmable, 2 USB Hubs) for Windows 【2 Layers, 26 Programmable Keys】Each key can be programmed with up to 30 characters. Experience the keypad mode with 4 programmable keys on Layer 1 (Mod 0). Switch to Layer 2 (Mod 1) for a fully programmable mode, excluding the "Enter" key. The asynchronous Num Lock function operates independently and does not affect the 10-key on the main keyboard. This product is unused. The instruction manual is written in Traditional Chinese. Thank you.