Sony KDL-55W900A - Manual (Page 230)

If the color buttons of the One-touch Remote Control do not work, press
the COLOR KEY button. The color LEDs light up and the color buttons
can be use.
Batteries drain quickly.
If you keep waving your NFC compatible device over the NFC touch point
on the rear of the remote control, it will increase battery drain. It may be
improved by keeping the NFC device away from the remote control.
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