sildenafil citrate without a doctor prescription I recently got into a debate that triggered a call for analysis. Are lunchbox PSU’s/Shielding drastically different between products? Curiosity got the best of me and had to find out. I use three different manufactures myself API, BAE, & RND. Being all respected brands I wasn’t expecting to see drastic differences. Two of three have built-in PSU’s and thought that might have some impact.