Gowoops 5 Sets of 433Mhz RF Transmitter and Receiver Link Kit for Arduino (2pcs/set)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>VCC voltage module operating voltage and good power filtering</li><li>Great influence on the antenna module reception， preferably connected to the 1/4 wavelength of the antenna， typically 50 ohm single conductor</li><li>The length of the antenna 433M is about 17cm</li><li>Antenna position has also affected the reception of the module， the installation， the antenna as possible straight away from the shield， high pressure， and interference source</li><li>Frequency used to receive， decode and oscillation resistor should match with the transmitter</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51RA-vP17kL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41RcnxVDOeL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41TVM-0r3%2BL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41J-5J2DWsL.jpg" noproxy>