iGS20E / iGS130 will automatically calculate the sunrise and sunset time based on the GPS position.
Backlight turns on before sunset and turns off after sunrise automatically.
When backlight is off, select any button to turn on backlight for 15 seconds.
If the backlight can't work well at night,pls try the following tips:
1. Reset the device to the correct time zone.
2. Relocate the GPS signal had been well located.
If the problem still persists, pls contact with iGPSPORT customer service by submitting a request.