Bluetooth numeric keypad. I've used it a few times, but I'm selling it because I bought a similar product. Here's the product description: Designed for genuine quiet operation, it's perfect for use in places or at times where noise is a concern! Furthermore, it has an antibacterial specification to add peace of mind to your daily computer operations. A Bluetooth(R) quiet numeric keypad that connects wirelessly without blocking a USB port. - Color: Black - Key Arrangement: Numeric Keypad - Brand: ELECOM There is no instruction manual, but you can view the manual with the QR code on the back. It will be shipped in simple packaging.