Give you and your loved ones some peace of mind with the Angi Crash Sensor from Specialized. This lightweight, compact sensor mounts to any Specialized Angi-ready helmet (and most other cycling helmets), and features built-in crash detection technology to help you stay safe on your ride. In the event of a crash, the Angi sensor begins a countdown on your smartphone. If you're ok, simply cancel the countdown and continue your ride. If the countdown expires, Angi sends an alert to your emergency contacts with your last known GPS coordinates and a message that you need help. In short, it's a simple, inexpensive way to add another level of safety when you're out on the road or trails.