Electronic jewelry might be something that will help you stand out from the crowd at the Christmas party, and if you agree with that idea, maybe you could check out the Heart Spark necklace pendant. The device features a polar heart rate monitor built into it and features a real-time clock and extra storage in the event it’s needed. It’s designed to look like something taken out from a computer and has LEDs that flash in coordination with your heartbeat. Of course, if you happen to see some handsome fellow at a party, this pendant might tip him off as to what you’re thinking.