1. Shielded? For real? How do you do that with a plastic case that appears to be metal at first glance? 2. If someone wants to tie the cable before punching, they can no longer use the screw holes, and the device cannot be fixed with screws. Huh?> Yes, really. You MUST install the device first and then punch it. (Yes, try this if you're making a basement connection, or in the basement if the "box" needs to be set up [and stuffed] overhead.) Still. Although the developer of this product has probably never used it in the field, it works. Tripp-Lite does and stands behind good things, but the design of this product could certainly be improved. (Shielded - right? -10 dB? -100 dB? At which frequencies?)