I purchased a mini wireless keyboard with touchpad on Ebay for about $16. It works without any configuration. The 2-sided "manual" - one side in Chinese, the other in English - just says "Mini Wireless Keyboard" and on the bottom of the front "smart remote for PC and Android TV". It comes with a very small USB dongle (in my powered hub) and a USB extension cable about 18 inches long. The front of the info sheet is in red and black, with a picture of the keyboard. Wish there was a brand name, but there's nothing in English, at least. Uses 2 AAA batteries, not supplied.