The threshold of acceleration that corresponds to a concussion can be set by the user. There are various numbers that appear in the literature that are likely to result in a concussion. To download the raw data off of the device, a "docking station" with pogo pins is used to make contact with the test points located on the back of the device, just below the battery. This saves the cost and space of a connector.
As someone who has suffered a TBI in my early teens this is a huge step in the right direction. I was asked to keep skiing after the worst hit, which blew a gopro adhesive mount straight off my helmet (unloaded, did not have camera attached). These are designed to stay on race cars going 100+ MPH. Because no one warned me I was back skiing in a week only to fracture my back and hit my head again.
Great project.