Audible and visual alarms when temperatures exceed your pre-set minimum and maximum selection * Remote sensors are equipped with spring action clips to secure inside regrigerator or freezer. Suction cups included * Main unit equipped with a fold out stand and magnets on back of unit * Temperature range -4 degF to 158 degF with alkaline batteries, -22 degF to 158 degF with lithium batteries (not included) * Main Unit (2 AAA Batteries) Remotes (2 AA Batteries)