1. The Trizor Model 15XV is 120V-60HZ., and 125 Watts
2. Question: What Side of a Single Side Serrated Knife do I Sharpen?
Answer: The Scalloped Side of the Single Side Serrated Blade.
Using Stage 3 Only, Pull the Blade through on the side the Scalloped edge is on. When Sharpening the Blade pull through slowly only a few times for best results.