Attaches to outside of refrigerator or freezer, for food safety and energy efficiency. Audio/visual alert Signal sounds at 15 or 46°F (-9.5 or 8°C) Displays room & refrigerator/freezer temps 39" sensor cable Accuracy: Freezer ±4°F (2°C); Refrigerator ±2°F (1°C) -58 to +158°F/-50 to +70°C Sliding mode switches Selectable units 2-way mounting: Velcro®, suction Battery & instructions included Housing Material: ABS Battery: One AAA alkaline battery included Dimensions: 5.25 W x 1.0 H x 0.5 D in (13.3 W x 2.5 H x 1.3 D cm)