Feature 1Color Digital Display: Wireless thermometer hygrometer is a color digital display for clearer and more convenient viewing. 2Multi Functional: Digital hygrometer supports weather forecast, indoor and outdoor temperature and humidity, time, calendar, temperature trend and other key functions. 3Mirror: Temperature humidity monitor forecasts weather more accurately, the front side is made of mirror material, which can replace mirror. 4ABS Material: Thermometer hygrometer is made of premium ABS material, which is hard, non flammable and impact resistant. 5Stable: Temperature humidity gauge is curved back bracket, can be placed on the table firmly, not easy to fall down.Item Type: Wireless Thermometer Hygrometer Material: ABSGross Weight: Approx. 468g / 1.03lbExternal Sensor: 2 x AA Batteries (Shipped Without Batteries)Host: 3 x AAA BatteriesMainframe Size: Approx. 14.5x13.2cm / 5.7x5.2in Weather Station: 0C to +50CIndoor Humidity: 20% to 90%RH (Relative Humidity)Channel: Up to 3 External SensorsExternal Sensors: 30C to +60CReceiving Radio Control Signal: 77.5 KHzTransmission: 30m / 32.8yd, RF 433MHz, 10mWPlug: US 120V .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Wireless Thermometer Hygrometer1 x External Sensor1 x Instruction Manual1 x PlugNoteManual measurement, please allow slight error.