Could we see this in Polo? The ICEdot crash sensor is a Bluetooth low-energy device that senses extreme changes in movement, like when you’re in a bike accident. It connects to an online service via an iPhone app and after a crash is detected it launches a 45-second countdown on the phone which, if not canceled, then notifies your emergency contact. Becky Stern and Ladyada decided to take it apart to see how it works.