That shouldn't be a danger with PowerBeam's products: if the small camera on the transmitter fails to see the small light bulb of the receiver, it shuts down the laser within milliseconds.

Power beam公司的产品应该不存在这样的危险：如果传输器上的小摄像头没能捕捉到接收器灯泡发出的微弱光线，激光就会在几微秒内关掉。

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Powerbeam's solution is to fit a small fluorescent bulb to the receiving device so that a camera on the transmitter can track the light and steer the laser beam accordingly.

Powerbeam公司的方案是为接收设备配备一枚小型荧光灯泡，这样传输器的摄像头就能跟踪光线，并适时引导激光束方向。

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When I measured the light I used the Elinchrom Skyport radio transmitter to test trigger the lightning.

测光的时候，是使用Elinchrom Skyport无线电引闪器触发闪光灯。

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Unlike other pet-tracking devices, which can look like decommissioned Soviet-era spy gear, Tagg's waterproof transmitter is thin, light and styled to match Fido's and Whisker's high-tech lifestyles.

WSJ: Keep Tabs on Fido | Geek Chic

Each patch contains a microprocessor and memory along with either a radio transmitter, a sensor reactive to light or temperature, a microphone, batteries or a display.

CNN: The bag that watches your wallet

SKA, however, would be able to detect the leakage into space from a standard terrestrial television transmitter at a range of half a dozen light years or so.

ECONOMIST: Radio telescopes