1 x Host 2 x Sensor 1 x USer ManualFeatures: 1.Easy to read LCD screen displays the current indoor outdoor temperature.When insufficient electricity,there are will be shown on the LCD screen. 2.With a temperature trend indicator arrow and daily high and low information. 3.Display stands upright for tabletop use wall-mountable. 4.Includes 24 hours high and low records for temperature. 5.The display console displays temperature,minimum and maximum temperature, which can be reset manually. Specifications: 1.433 Mhz transmission frequency 2.Update Rate: 10 seconds 3.Transmission range up to 328 ft(range maybe shorter based on interference present) 4.Indoor Temperature range:0~5032 ~ 122 5.Outdoor Temperature range:-40~60-40 ~ 140 6. Power Supply: AAA Battery(Not included) Note: 1. Do not install the reverse battery 2. Do not put the receiver near metal 3. Avoid transmitter directly in the rain 4. High-quality batteries for the use of main unit and transmitter better 5. The sensor search mode allows you to re-sync sensors without removing and re-inserting batteries. How to Install the Sensor: The thermometer's digital display is magnet-mountable on a fridge,or use the integrated keyhole for wall mounting. The wireless thermometer sensors are equipped with a spring-loaded clips with a Plastic grip to securely attached to the edge of a shelf.