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 Max. and Min. information. 3.Display stands upright for tabletop use wall-mountable. Specifications: 1.433 Mhz transmission frequency 2.Update Rate: 10 seconds 3.Indoor Temperature range:0~5032 ~ 122 4.Outdoor Temperature range:-40~60-40 ~ 140 5.Upper/lower limit alarm function for indoor temperature 6.Upper/lower limit alarm function for the temperature in the double outdoor channels. 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.