I have a Rii I13 it's great but not the cheapest at £35.
It is an air mouse, keyboard, universal remote for 8 devices & skype handset (with built-in speaker and mic).
Has a small USB dongle as it works on 2.5ghz as well as Infrared. It's rechargable and lasts for around 1 month when used daily in air mouse mode and 3 months when just used as a IR remote (you can turn off the air mouse).
I have Kodi on an Acer Revo micro PC running Windows 10, the Rii works great in Kodi and with other program and is as responsive as any mouse.