Boser BPC-6170, Manual

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Life Expectancy of Constituent Parts
This section describes the life expectancy of constituent parts (backlight,
power supply, internal cooling fan and touch screen) which make up to
BPC-6170.
TFT Display Backlight
Display brightness decreases over time with use. The expected operating
lifetime of the backlight time to reach 50% initial brightness) is 30,000 hours
(assuming continuous lit state at 25 degrees C). Actual lifetime before
replacement is about 30,000 hours, although this depends on operating
conditions.
Touch Screen
The operating lifetime of the touch screen is approximately 1 million
operations (as tested by mechanical manipulation under 100g of force at a
rate of two presses per second)