Another word of advice when ordering RF modules, check to see if the distributor your ordering from will take returns on them. I recently lost over a hundred dollars on a set of units that couldnt be returned. Long story short I built the complete cicruit on PBC and used a cradle to attach the modules to see if they functioned and they didnt. After contacting tech support on the site I was told to solder them into place since the problem was probably from the stray capacitance in the cradles(I was aware at the time that you shouldnt breadboard RF units but I wanted to test them before soldering). Soldered them and still nodda, so I contacted tech support again asking for a replacment, alas they didnt offer replacements or refunds on any RF units soldered or not.