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Sainsmart 2-Channel 5V Relay Module for Arduino Raspberry Pi | For switching off power of accessoirs | 5.99$ | LINK |
http://myhowtosandprojects.blogspot.de/2014/02/sainsmart-2-channel-5v-relay-arduino.html <iframe width="560" height="315" src="//www.youtube.com/embed/0UMznpwC7sw" frameborder="0"></iframe>