this pack contains 3 refrigerator featuring clear buttons including Mode/Reset, High/Low, Alert/°C°F, for switching between Celsius and Fahrenheit; Each fridge requires one AAA battery, not included each freezer features a sensitive external probe that delivers fast and steady readings from remote locations; Suitable for reptile tanks, refrigerators, freezers, aquariums, greenhouses, and wine cellars built with a high precision probe sensor, this digital provides reliable results across a broad range; The large LCD screen displays real time with recorded high and low values for effortless monitoring of fluctuations in refrigerators, aquariums, or incubators the built in can be set to trigger when readings go beyond your chosen range; This feature helps you safeguard stored food, maintain stable pet habitats, and preserve equipment from temperature related damage each refrigerator includes a hook hole and a flat stand for multiple placement options; Install it on a fridge door, hang it on a wall, or place it on a countertop; Its compact size saves space and works well in refrigerators, wine cellars, aquariums, and incubators Color: As Shown Material: plastic Package Contents: 3*pcs Refrigerator Thermometer