Sony VGN-FE890N - Manual (Page 67)

67 n N
Using Your VAIO Computer
2 Remove the adhesive tape cover from the bottom of the remote sensor control (1).
3 Attach the remote sensor control (1) onto the set-top box (3) near the infrared port (4).
!
Do not cover the infrared port when attaching the remote sensor control.
The remote sensor must be visible in a line-of-sight with the remote commander in order to function properly.