FDG-985 4 IN 1 Gauging Tools Digital tire pressure guage Emergency hammer Flash light Seat belt cutter the hammer easily shatters glass to free when doors are jammed on land or under water. the seatbelt cutter quickly slices through a jammed seatbelt and the digital tire gauge accurately measures air pressure. use the flashlight in the event of a crash or nighttime. use 2 "aaa" batteries, not included. includes one cr 2032 lithium coin cell for tire gauge function.