The Doctor’s Nano-Recorder
The Doctor and his friends use the Nanorecorder to help them remember their encounters with members of The Silence. Record a message up to 10 seconds long and the red light will come on, letting you know you are ready for your injection. $29.99
Of course, this particular Nanorecorder won’t actually inject a glowing red thing into your palm. Pesky FDA, ruining a perfectly good product idea.