This HSK exam timer is designed to keep track of exam time and can be used by test takers during test practices or by test center administrators where permitted. Prior to practice or production use, make sure that this software works as intended for your particular exam session(s) and prepare a backup / workaround in case this timer does not function as intended while running. Before starting the timer switching the mobile phone to airplane / flight mode is strongly recommended. Also make sure that there is no other scheduled events that may interfere the session(s) while running this app. Please report bugs.