From another site [1], it seems as if it monitors the amount of time spent underwater, and is activated if this exceeds a preset amount of time. [1] http://www

From another site [1], it seems as if it monitors the amount of time spent underwater, and is activated if this exceeds a preset amount of time. [1] http://www.slate.com/blogs/future_tense/2013/05/28/seal_system_indiegogo_campaign_is_raising_money_for_drowning_detection_technology.html http://www.slate.com/blogs/future_tense/2013/05/28/seal_syst...