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 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 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.