What is this electronics component ?

Hello,

Can you answer the following question :

What is this electronics component ?

 
PS: it comes with the kit ardustation, but I do not know where the weld ...  

Nothing is said on the wiki ...

Sincerely,

Seb

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It works fine;-)

Now, I want to install an antenna followed.

I recycled my card ArduPilot, I connected to my pc (com 10, 38400), th

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3DR TELEMETRY http://www.goodluckbuy.com/ ???

Hello,

I saw the kit 3DR radio telemetry at this Internet address:
http://www.goodluckbuy.com/dual-ttl-3drobotics-3dr-radio-telemetry-kit-433mhz-for-apm-apm2.html

and

http://www.goodluckbuy.com/single-ttl-3drobotics-3dr-radio-telemetry-kit-433mhz-for-apm

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