As well as the location of the user’s phone, the Wearsafe app also streams audio so the alerted people can listen to what’s going on in the vicinity of the user to help them determine what type of emergency is taking place, and whether they should call 911 immediately or stage some other kind of intervention. Chosen contacts are alerted when help is needed via text, email and push notification. The user needs to have their phone on or near them for the alerts to work, and be connected to either Wi-Fi or a cell network. The tag is powered by a user replaceable coin battery which the founders say should last for up to six months. Unlike some of the tracking products designed for parents to keep tabs on their kids, Wearsafe’s hardware does not continually track the user’s location — but only sends info to their pre-selected contacts when the button is pressed. “Wearsafe gives the user full control over who to engage and when they are notified.