Athletes have to deal with concussions in certain sports. Concussions are bad on their own, but they are made worse when not caught immediately. The Jolt Sensor happens to be device that vibrates when you are hit in a dangerous way. The device is small and attaches to your head-worn equipment. It is waterproof and can withstand dirt, dust, sweat, and rain.
The Jolt Sensor has a rechargeable battery and Bluetooth. It is compatible with iOS and Android devices. It not only alerts you but also coaches and parents when there is a dangerous hit. Coaches can monitor their entire team with these gadgets. The developers are raising money for this project on Kickstarter.