As long as you upgrade to Windows 10 within the first year, you can continue using Windows 10 and getting updates for the «supported lifetime of the device.» (howtogeek.com)
Prior to this work, quantum - wells were incorporated near the collector in the base of a III - V heterojunction bipolar transistor, resulting in a heavily reduced radiative spontaneous recombination lifetime of the device. (sciencedaily.com)
«The second is efficiency [how much sunlight can be converted to power] and the third is the reliability, [which means the] lifetime of the device.» (scientificamerican.com)