Keep your fridge at the right temperature all year round. Simply attach the sensor to the desired position in the fridge or freezer and the thermometer on the outside with the attached magnets or enclosed hook/loop strip. Set your preferred reading of °C or °F and then set the minimum and maximum temperatures with the alarm. If the fridge goes below or above these set temperatures the alarm will sound until you manually turn it off to investigate the problem. No more spoiled food ever again. Shows room temperature at the touch of a button as well. Fridge/freezer temp range -50 to 70°C Display size 26(W) x 13(H)mm