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The units can be used to generate tiny amounts of power, and in principle, giant dipping birds could be constructed which would generate more power.

这些装置可以用来产生少量的能量，而且原则上，可以制造出能产生更多能量的巨型蘸水鸟。

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Embedded inside it is a batteryless RF switch, and the way it works is that upon the release of the spring mechanism inside, a tiny bit of power is generated for the 2.4GHz RF transmission ( ZigBee compatible), and whatever device is connected to the RF control outlet on the other end will receive the on or off signal.

ENGADGET: Mitsumi exhibits micro-vibration power generator and batteryless RF switch (video)

Renewable technologies, such as wind power, wave power and biomass power, are a tiny part of the energy mix, and are more expensive than nuclear power.

ECONOMIST: Energy policy: A nuclear waste | The

After the loss of internal power the spacecraft could only be tracked using the tiny radio transmitter in the lunar capsule.

BBC: 1962: First US rocket lands on Moon