Table 3.

Power consumption of common small electronic devices.

Device	Power Consumption	PEH	TEH
Watches [39]	3–10 µW	applicable	applicable
Smoke detector [40]	4.95 µW	applicable	applicable
Peacemakers [39]	25–80 µW	applicable	applicable
Capacitive strain gauge [41]	600 µW	applicable	applicable
Hearing aids [42]	<1.4 mW	applicable	applicable
CO2 sensor [43]	<3.5 mW	applicable	not applicable
Digital clocks [39]	13 mW	applicable	not applicable
Light-emitting diode [39]	25 mW–100 mW	applicable	not applicable