Safeguard your investment with this Wireless Digital Refrigerator/ Freezer Thermometer. Features an audible and visual alarm when temperatures exceed your pre-set minimum and maximum selection. The remote sensors are equipped with spring action clips to secure inside your refrigerator or freezer. The main unit is equipped with a fold out stand with magnets on the back- suction cups included. The temperature can range from -22F to 104F. The main unit takes two AAA alkaline batteries and the other two units take two AA batteries. Note: the freezer unit takes lithium batteries. Batteries not included.