163 • Appendix A: RK Link Phone App GX-3R Pro Operator’s Manual
Backlight Setting
1. Access the Gas Detector Setting Menu as described on page 160.
2. Press “Backlight setting”.
3. Set how long (in seconds) the backlight stays on after each button press. The options are 0-255
seconds. The factory setting is 30 seconds.
4. Press your phone’s “Back” button.