See what little is inside Logitech Harmony 350 universal remote control.
As MCU it uses PIC18F67J50, which is still available.
It has an EEPROM, an iR-LED and an iR-receiver.
Somehow I've lost the pictures of the PCB front - it only contains the common PCB buttons though.
Also see the Vodafone GigaTV 4K Box remote control.