Boser BPF-5017, Руководство пользователя

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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
BPF-5017.
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 result may be
different.
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)