From Thinkgeek:

With 13 gestures and 3 memory banks, you can store up to 39 remote control codes on the Sonic Screwdriver: plenty to control all of your Earth-based entertainment equipment. In Control Mode, each gesture triggers a classic Sonic Screwdriver sound effect and the tip illuminates with a bright green light. (There’s also a Quiet Mode if you’re stealthy.) And because The Doctor doesn’t let just anyone use his stuff, there’s a Lock Code that allows you to ensure that it’s yours… ALL YOURS.

[Twelfth Doctor’s Sonic Screwdriver Programmable TV Remote]