Prevent food spoilage and protect against food borne illnesses by storing foods at safe temperatures with this AcuRite Digital Thermometer. The bold, easy to read LCD screen displays the current temperatures inside your fridge and freezer, and the maximum / minimum temperatures recorded for each. Programmable alarm notifies you audibly and visually when temperatures exceed your pre-set minimum / maximum temperature range. Display features a magnetic backing to stick on the fridge or stands upright for countertop use. The two remote sensors feature powerful wireless technology, wireless signal indicator light, and versatile mounting options including an integrated suction cup or spring-loaded clip. One-year limited warranty. It"s more than accurate, it"s AcuRite. Digital Display Features: Monitor fridge / freezer temperature (°F or °C) Audible and visual alarm when temperatures exceed your pre-set minimum / maximum temperature range Measures temperatures from -40°F to 158°F (-40°C to 70°C) Minimum / maximum temperature records Fold-out stand for countertop use or magnet-mountable design Low battery indicator NSF safety certified Requires 2 AAA Batteries (not included) #45026 and 4 AA Batteries (not included) #45001 Size: 2.4"H x 5.8"W x 1"D Wireless Sensor Features: Secure inside refrigerator or freezer with integrated suction cup or spring-loaded clip Wireless signal indicator light Wireless technology transmits data through walls & from a distance Strong signal penetration (enhanced 433 MHz) RF (wireless) Range: 330" (100m) Size: 4.1"H x 1.4"W x 1.5"D