TRACKER IN IT IT CAN BE SET FOR 911 OR ON ALL THE TIME I KEEP IT ON AT ALL TIMES IN CASE THE BUS GOES ASTRAY SO THEY CAN FIND ME IN THE WOODS OR IN A TREE :O) CAUSE YA NEVER KNOW WHEN ITS UR TIME SO IF I AM NOT HEARD FROM THEY CAN LOCATE MY WHERE ABOUTS EVEN IF IM HIDING IN THE BACK ROOM OF A BUFFET :O)