Press START key LCD will display BL.OFF symbol on the upper part indicating backlight time setting mode.
Set the time by using the pair of ▲ / ▼. And the unit is second.
Each pair of ▲ / ▼ keys corresponds to each digit of the LCD reading. Each press of ▲ / ▼ key increases or decreases the digit. Increasing the digit from 9 or decreasing it from 0 causes the digit to overflow or underflow, allowing you to set the output value without interruption. Holding down ▲ / ▼ key continuously changes the digit. And the value won't change if it is increased or decreased to the Maxim or Minimum value. The setting range is confined within 0-3600 seconds.
Press ON key, LCD will display SAVE symbol on the upper part for 1 sec.
Tips: When the default value is 0, the backlight won't be off automatically except that you turn it off manually.